Bill Clinton

Presidential historian Michael Beschloss discusses the upcoming Impeachment vote in the House. He is author of "Taking Charge: the Johnson White House tapes 1963-64" now in paperback.

President Carter has written 13 books since leaving office. His latest is "The Virtues of Aging" (Ballantine). In his retirement, Carter founded The Carter Center and launched The Atlanta Project a communitywide effort to attack the social problems associated with poverty.

Satirist and columnist Harry Shearer. He's the host of the syndicated NPR radio program, "Le Show," does several voices on "The Simpsons" and is a weekly commentator on ABC TV's World News Now. He talks about the Clinton sex scandal.