Dirty Tricks on the Campaign Trail

Bad news about a candidate? Look to the '08 campaigns' opposition researchers.

Dirty Tricks on the Campaign Trail

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And no one has done that better than Republican operative Mark Corallo, who says he helped put President George Bush in the White House by planting opposition research with reporters.

"That was me behind the scenes, passing the information that was developed," he told ABC News. (ABC News)

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