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| Season Episode: 4x02 |
| Episode: 333 |
| Production Number: 4002 |
| Original Air Date: 2008-01-08 |
| Title: Chris Beam, Gary Rosen |
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| Season Episode: 4x05 |
| Episode: 336 |
| Production Number: 4005 |
| Original Air Date: 2008-01-14 |
| Title: Neil Shubin |
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| Season Episode: 4x07 |
| Episode: 338 |
| Production Number: 4007 |
| Original Air Date: 2008-01-16 |
| Title: Deborah Tannen |
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| Season Episode: 4x08 |
| Episode: 339 |
| Production Number: 4008 |
| Original Air Date: 2008-01-17 |
| Title: Lou Dobbs, David Levy |
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| Season Episode: 4x14 |
| Episode: 345 |
| Production Number: 4014 |
| Original Air Date: 2008-01-29 |
| Title: Joe Quesada, Alex Ross |
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| Season Episode: 4x20 |
| Episode: 351 |
| Production Number: |
| Original Air Date: 2008-02-07 |
| Title: Mark Moffett |
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| Season Episode: 4x25 |
| Episode: 356 |
| Production Number: |
| Original Air Date: 2008-02-26 |
| Title: Henry Louis Gates Jr. |
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| Season Episode: 4x26 |
| Episode: 357 |
| Production Number: |
| Original Air Date: 2008-02-27 |
| Title: Tony Snow |
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| Season Episode: 4x31 |
| Episode: 362 |
| Production Number: |
| Original Air Date: 2008-03-06 |
| Title: John Legend |
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| Season Episode: 4x32 |
| Episode: 363 |
| Production Number: |
| Original Air Date: 2008-03-10 |
| Title: George McGovern |
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| Season Episode: 4x33 |
| Episode: 364 |
| Production Number: |
| Original Air Date: 2008-03-11 |
| Title: Geraldo Rivera |
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| Season Episode: 4x34 |
| Episode: 365 |
| Production Number: |
| Original Air Date: 2008-03-12 |
| Title: Howard Kurtz |
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| Season Episode: 4x36 |
| Episode: 367 |
| Production Number: |
| Original Air Date: 2008-03-17 |
| Title: Samantha Power |
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| Season Episode: 4x37 |
| Episode: 368 |
| Production Number: |
| Original Air Date: 2008-03-18 |
| Title: Carole King |
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| Season Episode: 4x38 |
| Episode: 369 |
| Production Number: |
| Original Air Date: 2008-03-19 |
| Title: Dee Dee Myers |
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| Season Episode: 4x39 |
| Episode: 370 |
| Production Number: |
| Original Air Date: 2008-03-20 |
| Title: Dean Kamen |
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| Season Episode: 4x41 |
| Episode: 372 |
| Production Number: |
| Original Air Date: 2008-04-01 |
| Title: Van Jones |
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| Season Episode: 4x42 |
| Episode: 373 |
| Production Number: |
| Original Air Date: 2008-04-02 |
| Title: R.E.M. |
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| Season Episode: 4x43 |
| Episode: 374 |
| Production Number: |
| Original Air Date: 2008-04-03 |
| Title: Clay Shirky |
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| Season Episode: 4x45 |
| Episode: 376 |
| Production Number: |
| Original Air Date: 2008-04-08 |
| Title: Madeleine Albright |
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| Season Episode: 4x46 |
| Episode: 377 |
| Production Number: |
| Original Air Date: 2008-04-09 |
| Title: Jeff Gore |
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| Season Episode: 4x47 |
| Episode: 378 |
| Production Number: |
| Original Air Date: 2008-04-10 |
| Title: Robin Wright |
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| Season Episode: 4x53 |
| Episode: 384 |
| Production Number: |
| Original Air Date: 2008-04-22 |
| Title: Susan Jacoby |
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| Season Episode: 4x54 |
| Episode: 385 |
| Production Number: |
| Original Air Date: 2008-04-23 |
| Title: Mitch Albom |
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| Season Episode: 4x55 |
| Episode: 386 |
| Production Number: |
| Original Air Date: 2008-04-24 |
| Title: Maria Shriver |
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| Season Episode: 4x56 |
| Episode: 387 |
| Production Number: |
| Original Air Date: 2008-04-28 |
| Title: Feist |
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| Season Episode: 4x57 |
| Episode: 388 |
| Production Number: |
| Original Air Date: 2008-04-29 |
| Title: Anne Lamott |
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| Season Episode: 4x59 |
| Episode: 390 |
| Production Number: |
| Original Air Date: 2008-05-01 |
| Title: James Kunstler |
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| Season Episode: 4x60 |
| Episode: 391 |
| Production Number: |
| Original Air Date: 2008-05-05 |
| Title: Carl Hiaasen |
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| Season Episode: 4x61 |
| Episode: 392 |
| Production Number: |
| Original Air Date: 2008-05-06 |
| Title: Nathan Gunn |
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| Season Episode: 4x63 |
| Episode: 394 |
| Production Number: |
| Original Air Date: 2008-05-08 |
| Title: Arianna Huffington |
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| Season Episode: 4x64 |
| Episode: 395 |
| Production Number: |
| Original Air Date: 2008-05-12 |
| Title: Dr. Mehmet Oz |
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| Season Episode: 4x67 |
| Episode: 398 |
| Production Number: |
| Original Air Date: 2008-05-15 |
| Title: Andrei Cherny |
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| Season Episode: 4x69 |
| Episode: 400 |
| Production Number: |
| Original Air Date: 2008-05-28 |
| Title: Sen. Claire McCaskill |
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| Season Episode: 4x71 |
| Episode: 402 |
| Production Number: |
| Original Air Date: 2008-06-02 |
| Title: Jon Paskowitz |
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| Season Episode: 4x72 |
| Episode: 403 |
| Production Number: |
| Original Air Date: 2008-06-03 |
| Title: George Will |
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| Season Episode: 4x74 |
| Episode: 405 |
| Production Number: |
| Original Air Date: 2008-06-05 |
| Title: Pat Buchanan |
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| Season Episode: 4x75 |
| Episode: 406 |
| Production Number: |
| Original Air Date: 2008-06-09 |
| Title: Phil Weiss |
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| Season Episode: 4x76 |
| Episode: 407 |
| Production Number: |
| Original Air Date: 2008-06-10 |
| Title: Alan Rabinowitz |
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| Season Episode: 4x77 |
| Episode: 408 |
| Production Number: |
| Original Air Date: 2008-06-11 |
| Title: David Hajdu |
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| Season Episode: 4x79 |
| Episode: 410 |
| Production Number: |
| Original Air Date: 2008-06-16 |
| Title: Kenneth R. Miller |
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| Season Episode: 4x82 |
| Episode: 413 |
| Production Number: |
| Original Air Date: 2008-06-19 |
| Title: Bishop N.T. Wright |
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| Season Episode: 4x83 |
| Episode: 414 |
| Production Number: |
| Original Air Date: 2008-06-23 |
| Title: Barbara Ehrenreich |
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| Season Episode: 4x84 |
| Episode: 415 |
| Production Number: |
| Original Air Date: 2008-06-24 |
| Title: Jason Bond, Will Smith |
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| Season Episode: 4x86 |
| Episode: 417 |
| Production Number: |
| Original Air Date: 2008-06-26 |
| Title: Rep. Robert Wexler |
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| Season Episode: 4x89 |
| Episode: 420 |
| Production Number: |
| Original Air Date: 2008-07-16 |
| Title: Rush |
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| Season Episode: 4x90 |
| Episode: 421 |
| Production Number: |
| Original Air Date: 2008-07-17 |
| Title: Elizabeth Edwards |
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| Season Episode: 4x91 |
| Episode: 422 |
| Production Number: |
| Original Air Date: 2008-07-21 |
| Title: Sen. Jim Webb |
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| Season Episode: 4x92 |
| Episode: 423 |
| Production Number: |
| Original Air Date: 2008-07-22 |
| Title: Margaret Spellings |
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| Season Episode: 4x93 |
| Episode: 424 |
| Production Number: |
| Original Air Date: 2008-07-23 |
| Title: Nas |
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| Season Episode: 4x95 |
| Episode: 426 |
| Production Number: |
| Original Air Date: 2008-07-28 |
| Title: Toby Keith |
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| Season Episode: 4x96 |
| Episode: 427 |
| Production Number: |
| Original Air Date: 2008-07-29 |
| Title: Eric Roston |
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| Season Episode: 4x97 |
| Episode: 428 |
| Production Number: |
| Original Air Date: 2008-07-30 |
| Title: Crosby, Stills & Nash |
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| Season Episode: 4x100 |
| Episode: 431 |
| Production Number: |
| Original Air Date: 2008-08-05 |
| Title: David Carr |
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| Season Episode: 4x103 |
| Episode: 434 |
| Production Number: |
| Original Air Date: 2008-08-11 |
| Title: Jorge Ramos |
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| Season Episode: 4x104 |
| Episode: 435 |
| Production Number: |
| Original Air Date: 2008-08-12 |
| Title: Joey Cheek, Jane Mayer |
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| Season Episode: 4x105 |
| Episode: 436 |
| Production Number: |
| Original Air Date: 2008-08-13 |
| Title: Dick Meyer |
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| Season Episode: 4x106 |
| Episode: 437 |
| Production Number: |
| Original Air Date: 2008-08-14 |
| Title: Bing West |
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| Season Episode: 4x108 |
| Episode: 439 |
| Production Number: |
| Original Air Date: 2008-08-27 |
| Title: Gov. Mike Huckabee |
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| Season Episode: 4x109 |
| Episode: 440 |
| Production Number: |
| Original Air Date: 2008-08-28 |
| Title: Rick Brookhiser |
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| Season Episode: 4x110 |
| Episode: 441 |
| Production Number: |
| Original Air Date: 2008-08-29 |
| Title: John McWhorter |
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| Season Episode: 4x111 |
| Episode: 442 |
| Production Number: |
| Original Air Date: 2008-09-02 |
| Title: Laura D'Andrea Tyson |
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| Season Episode: 4x112 |
| Episode: 443 |
| Production Number: |
| Original Air Date: 2008-09-03 |
| Title: Doris Kearns Goodwin |
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| Season Episode: 4x114 |
| Episode: 445 |
| Production Number: |
| Original Air Date: 2008-09-05 |
| Title: Gov. David Paterson |
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| Season Episode: 4x115 |
| Episode: 446 |
| Production Number: |
| Original Air Date: 2008-09-15 |
| Title: Peter J. Gomes |
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| Season Episode: 4x117 |
| Episode: 448 |
| Production Number: |
| Original Air Date: 2008-09-17 |
| Title: Bob Lutz |
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| Season Episode: 4x118 |
| Episode: 449 |
| Production Number: |
| Original Air Date: 2008-09-18 |
| Title: Maria Bartiromo |
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| Season Episode: 4x119 |
| Episode: 450 |
| Production Number: |
| Original Air Date: 2008-09-23 |
| Title: Jackson Browne |
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| |
| Season Episode: 4x121 |
| Episode: 452 |
| Production Number: |
| Original Air Date: 2008-09-25 |
| Title: Nicholas Carr |
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| Season Episode: 4x122 |
| Episode: 453 |
| Production Number: |
| Original Air Date: 2008-09-29 |
| Title: Paul Begala |
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| Season Episode: 4x123 |
| Episode: 454 |
| Production Number: |
| Original Air Date: 2008-09-30 |
| Title: James Taylor |
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| Season Episode: 4x124 |
| Episode: 455 |
| Production Number: |
| Original Air Date: 2008-10-01 |
| Title: Dave Levin |
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| |
| Season Episode: 4x126 |
| Episode: 457 |
| Production Number: |
| Original Air Date: 2008-10-06 |
| Title: Jim Cramer |
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| Season Episode: 4x127 |
| Episode: 458 |
| Production Number: |
| Original Air Date: 2008-10-07 |
| Title: Nate Silver |
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| Season Episode: 4x128 |
| Episode: 459 |
| Production Number: |
| Original Air Date: 2008-10-08 |
| Title: Joe Scarborough |
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| |
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| Season Episode: 4x131 |
| Episode: 462 |
| Production Number: |
| Original Air Date: 2008-10-14 |
| Title: Joseph Stiglitz |
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| Season Episode: 4x132 |
| Episode: 463 |
| Production Number: |
| Original Air Date: 2008-10-15 |
| Title: Tina Brown |
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| |
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| Season Episode: 4x135 |
| Episode: 466 |
| Production Number: |
| Original Air Date: 2008-10-21 |
| Title: Michael Farris |
| |
| Season Episode: 4x136 |
| Episode: 467 |
| Production Number: |
| Original Air Date: 2008-10-22 |
| Title: David Frum |
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| Season Episode: 4x137 |
| Episode: 468 |
| Production Number: |
| Original Air Date: 2008-10-23 |
| Title: Jonathan Alter |
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| Season Episode: 4x138 |
| Episode: 469 |
| Production Number: |
| Original Air Date: 2008-10-27 |
| Title: Yo-Yo Ma |
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| |
| Season Episode: 4x140 |
| Episode: 471 |
| Production Number: |
| Original Air Date: 2008-10-29 |
| Title: David Simon |
| |
| Season Episode: 4x141 |
| Episode: 472 |
| Production Number: |
| Original Air Date: 2008-10-30 |
| Title: Wilco |
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| |
| Season Episode: 4x143 |
| Episode: 474 |
| Production Number: |
| Original Air Date: 2008-11-04 |
| Title: Live Election Show |
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| |
| Season Episode: 4x145 |
| Episode: 476 |
| Production Number: |
| Original Air Date: 2008-11-06 |
| Title: Rachel Maddow |
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| |
| Season Episode: 4x147 |
| Episode: 478 |
| Production Number: |
| Original Air Date: 2008-11-12 |
| Title: Bob Woodward |
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| Season Episode: 4x148 |
| Episode: 479 |
| Production Number: |
| Original Air Date: 2008-11-13 |
| Title: Stephen Moore |
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| |
| Season Episode: 4x150 |
| Episode: 481 |
| Production Number: |
| Original Air Date: 2008-11-18 |
| Title: Paul Simon |
| |
| Season Episode: 4x151 |
| Episode: 482 |
| Production Number: |
| Original Air Date: 2008-11-19 |
| Title: Michael Lewis |
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| |
| |
| Season Episode: 4x154 |
| Episode: 485 |
| Production Number: |
| Original Air Date: 2008-12-02 |
| Title: Jeffrey Goldberg |
| |
| Season Episode: 4x155 |
| Episode: 486 |
| Production Number: |
| Original Air Date: 2008-12-03 |
| Title: Barbara Walters |
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| |
| Season Episode: 4x157 |
| Episode: 488 |
| Production Number: |
| Original Air Date: 2008-12-08 |
| Title: Geoffrey Canada |
| |
| |
| Season Episode: 4x159 |
| Episode: 490 |
| Production Number: |
| Original Air Date: 2008-12-10 |
| Title: Richard Haass |
| |
| Season Episode: 4x160 |
| Episode: 491 |
| Production Number: |
| Original Air Date: 2008-12-11 |
| Title: Michael Phelps |
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