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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Now in the primary season as each party chooses a candidate, it's mostly Republican against Republican and Democrat against Democrat.

Last month, two Clinton volunteers were fired after forwarding this e-mail claiming Obama was part of a Muslim effort to destroy the United States from the inside out. (ABC News)

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