Christine O'Donnell

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Rep. Mike Castle, left, a Republican candidate for U.S. Senate from Delaware, is helped off stage after addressing supporters after his defeat on primary election night Tuesday, Sept. 14, 2010, in Wilmington, Del. Christine O'Donnell defeated Castle. (AP Photo/Steve Ruark)

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Republican Senate candidate Christine O'Donnell smiles while addressing supporters after winning the Republican nomination for Senate in Delaware, Tuesday, Sept. 14, 2010, in Dover, Ms. O'Donnell upset Rep. Mike Castle. (AP Photo/Rob Carr)

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Associated Press Senate candidate Christine O'Donnell chats with voters in Wilmington, Del., on Tuesday. Ms. O'Donnell took on nine-term Rep. Michael N. Castle in the Republican primary for a U.S. Senate seat.

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Senate candidate Christine O'Donnell chats with voters in Wilmington, Del., on Tuesday. Ms. O'Donnell took on nine-term Rep. Michael N. Castle in the Republican primary for a U.S. Senate seat. (AP Photo)

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Rep. Michael N. Castle, who has held elective office in Delaware since the mid-1980s, finds himself unexpectedly behind "tea party" favorite Christine O'Donnell in the Republican primary for the Senate. (AP Photo)

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Delaware Republican Senate candidate Christine O'Donnell addresses supporters during a Tea Party Express news conference in support of her election bid in Wilmington, Del., on Tuesday, Sept. 7, 2010. (AP Photo/Rob Carr)

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