United States Senate

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Former Virginia Governor and Republican U.S. Senate candidate George Allen and his wife Susan spend time talking with supporters after casting their votes in the Republican Primary at Washington Mill Elementary School in Alexandria, Va., Tuesday, June 12, 2012. (Rod Lamkey Jr/The Washington Times)

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Former Virginia Governor and Republican U.S. Senate candidate George Allen and his wife Susan spend time talking with supporters after casting their votes in the Republican Primary at Washington Mill Elementary School in Alexandria, Va., Tuesday, June 12, 2012. (Rod Lamkey Jr/The Washington Times)

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Former Virginia Governor and Republican U.S. Senate candidate George Allen and his wife Susan make their exit en route to the next precinct to visit voters, after casting their votes in the Republican Primary at Washington Mill Elementary School in Alexandria, Va., Tuesday, June 12, 2012. (Rod Lamkey Jr/The Washington Times)

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Former Virginia Governor and Republican U.S. Senate candidate George Allen and his wife Susan arrive to cast their votes in the Republican Primary at Washington Mill Elementary School in Alexandria, Va., Tuesday, June 12, 2012. (Rod Lamkey Jr/The Washington Times)

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Former Virginia Governor and Republican U.S. Senate candidate George Allen and his wife Susan greet supporters as they arrive to cast their votes in the Republican Primary at Washington Mill Elementary School in Alexandria, Va., Tuesday, June 12, 2012. (Rod Lamkey Jr/The Washington Times)

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Former Virginia Governor and Republican U.S. Senate candidate George Allen and his wife Susan greet supporters as they arrive to cast their votes in the Republican Primary at Washington Mill Elementary School in Alexandria, Va., Tuesday, June 12, 2012. (Rod Lamkey Jr/The Washington Times)

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Elizabeth Warren, Democratic candidate for U.S. Senate in Massachusetts, addresses questions on her claim of Native American heritage. Ms. Warren was listed as Native American in several law school directories. (Associated Press)

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Nebraska state Sen. Deb Fischer (left), state Attorney General Jon Bruning (center) and state Treasurer Don Stenberg vie for the Republican nomination in one of the nation's most hotly contested U.S. Senate races during a debate in Omaha, Neb., on Sunday, April 15, 2012. (AP Photo/Nati Harnik)

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Tea party activist Jamie Radtke, of Chesterfield County, Va., is among four Republicans vying for the party's U.S. Senate nomination. (The Washington Times)

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** FILE ** In this April 4, 2012, file photo, Sen. Orrin Hatch, center, faces off with Republican candidates for U.S. Senate Chris Herrod, left, and and Dan Liljenquist, during a debate sponsored by the Utah League of Women Voters in Salt Lake City. (AP Photo/The Salt Lake Tribune, Rick Egan, File)

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Chuck Hassebrook (left) bows out of the race for Nebraska's open U.S. Senate seat Thursday and endorses Bob Kerrey (right), a former governor and senator from the state. The two men had been vying for the Democratic nomination to replace the retiring Sen. Ben Nelson. (Associated Press)

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Bob Kerrey says Wednesday in Omaha he will seek the Democratic nomination for the U.S. Senate seat from Nebraska he once held, reversing course just weeks after publicly rejecting a run he had called a long shot. He would replace retiring Democratic Sen. Ben Nelson. (Associated Press)

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Outside groups on both sides are spending millions of dollars on Massachusetts' high-profile U.S. Senate race between Republican Sen. Scott P. Brown and Democratic challenger Elizabeth Warren (seen here). The level of spending foreshadows the role such groups will play in many of next fall's big political matchups. (Associated Press)

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Outside groups on both sides are spending millions of dollars on Massachusetts' high-profile U.S. Senate race between Republican Sen. Scott P. Brown (seen here) and Democratic challenger Elizabeth Warren. The level of spending foreshadows the role such groups will play in many of next fall's big political matchups. (Associated Press)

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Jamie Radtke, Tea Party candidate for U.S. Senate (left), talks with supporter Tommy Moser (center) of Rockingham County, Va., at a protest outside a debate between Tim Kaine and George Allen. Third-party candidates were excluded from participating in the debate in Richmond on Wednesday. (Andrew Harnik/The Washington Times)