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Over the next few days, the debate over the Lewinsky mess will narrow to this difficult question: Did Clinton behave so badly that he abused the power of his office? History offers little guidance, but one of the most recent impeachments doesn't bode well for him: U.S. District Judge Walter Nixon of Mississippi was impeached and removed in 1989. He had allegedly accepted a bribe, but that's not what got him impeached. Lying to the grand jury did.
--By John Cloud