It's probably the oddest political sign in Iowa: "Bill Clinton endorses John Edwards." But there it is inside Edwards's campaign office in Carroll, Iowa. And while seemingly improbable, it's true. The twist: It's not that Bill Clinton, but William J. Clinton from nearby Lidderdale, Iowa. "Hello, I'm Bill Clinton," is how he recently introduced himself, whipping out his driver's license to prove it to our skeptical reporter.