Guests: Correspondent Lesley Stahl, actor Robin Williams, former HHS Sec. Tommy Thompson, Sen. Joe Biden, actor Don Cheadle

Guests: Former baseball slugger José Canseco, actor Tim Robbins, Rep. Stephanie Tubbs Jones, talk show host Tucker Carlson, Gov. Mike Huckabee

Guests: Former U.S. Attorney General Janet Reno, former NIH administrator Bernadine Healy, actor Dave Foley, Ward Churchill and Michael Faughnan, and comic Whoopi Goldberg via satellite.

Guests: Rep. Barney Frank, comedian Richard Belzer, writer Andrew Breitbart, writer Irshad Manji, and writer Camille Pagila.

Guests: Gov. Frank Murkowski, actor Jason Alexander, Gov. Christie Whitman, Rep. Ileana Ross-Lehtinen, and author Thomas Frank.

Guests: TV host Bill O'Reilly, academic Cornel West, actor Alec Baldwin, actor/comedienne Whoopi Goldberg, and Rev. Jesse Jackson.

Guests: former Gov. Mario Cuomo, actor Ian McShane, writer Arianna Huffington, TV host Rev. Joe Watkins, and conservative Richard Perle.

Guests: Columnist Thomas Friedman, writer David Frum, singer Natalie Mames, Gen. Wesley Clark and Sen. Barbara Boxer.

Guests: Actress Jane Fonda, talk show host Joe Scarborough, columnist Maureen Dowd, former Sen. Alan Simpson, environmentalist Robert F. Kennedy, Jr.

Guests: Senator Charles Schumer (D) New York, Lt. Gov. Michael Steele (R) Maryland, Farai Chideya, Martin Short, and Jeff Gannon.

Guests: Former Sec. of State Madeleine Albright, blogger Andrew Sullivan, former Canadian PM Kim Campbell, actor Michael McKean, and Rep. Bernie Sanders.

Guests: Sen. Norm Coleman, talk radio's Al Franken, reporter Liz Marlantes, author Gore Vidal, and basketball's Charles Barkley.

Guests: Conservative activist Phyllis Schlafly; Iraq war veteran, Paul Hackett; former Homeland Security Under Secretary Asa Hutchinson; political consultant Kellyanne Conway; actor/comic Chris Rock.

Guests: Activist Cindy Sheehan, Gov. Mike Huckabee, journalist Dan Savage, feminist activist Eve Ensler, novelist Kinky Friedman

Guests: Television journalist Anderson Cooper, Stephen Schneider, Michael Eric Dyson, actor Bradley Whitford, professor Mary Frances Berry, journalist Fareed Zakaria

Guests: Walter Maestri, Joe Scarborough, comedian George Carlin, Cynthia Tucker, conservative editorialist James K. Glassman, writer Kurt Vonnegut

Guests: Sen. Charles Schumer, PJ O'Rourke, Joy Behar, Willie Brown, Dan Senor

Guests: Singer Willie Nelson, Rep. David Dreier, author/journalist Christopher Hitchens, BBC News correspondent Katty Kay, British politician George Galloway, journalist Andrea Mitchell

Guests: Conservative columnist Ann Coulter, journalist Andrew Sullivan, actor Ben Affleck, writer Salman Rushdie, soldier/author Kayla Williams

Guests: Former Sen. Max Cleland, columnist Tina Brown, actor/comedian Larry Miller, author Tom Wolfe, police chief Richard Pennington, former Sen. John Edwards

Guests: Arianna Huffington, Tucker Carlson, Michel Martin, Spike Lee, Chris Webber

Guests: Richard A. Clarke, reporter Helen Thomas, actor Billy Connolly, TV host Tony Snow, writer Nadira Hira

Guests: fmr Pres. Mary Robinson of Ireland, Joe Scarborough, John Waters, fmr. Sen. Tom Daschle, Dr. Sanjay Gupta