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AP: O'Donnell beats Castle

In perhaps the most surprising outcome of an already surprising primary season, the Associated Press has projected that Christine O'Donnell has beaten Rep. Mike Castle in Delaware's GOP Senate primary.

With 86% of districts reporting, O'Donnell is leading Castle, 54%-46%.

O'Donnell will take on Democrat Chris Coons in the general election, and Coons will start out as the front-runner for Joe Biden's old Senate seat.