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CINCINNATI, OH - FEBRUARY 20: Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks about creating jobs and keeping taxes low to employees at Meridian Bioscience on February 20, 2012, in Cincinnati, Ohio. Romney told voters he would cut the federal budget in...

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CINCINNATI, OH - FEBRUARY 20: Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks about creating jobs and keeping taxes low to employees at Meridian Bioscience on February 20, 2012, in Cincinnati, Ohio.

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CINCINNATI, OH - FEBRUARY 20: United Staes Senator Rob Portman, R-OH (L), introduces Republican presidential candidate, former Massachusetts Gov. Mitt Romney (R), before he spoke about creating jobs and keeping taxes low to employees at Meridian Bioscience on February 20, 2012, in...

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CINCINNATI, OH - FEBRUARY 20: Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets employees at Meridian Bioscience during a campagin stop February 20, 2012 in Cincinnati, Ohio. Romney told voters he would cut the federal budget in part by giving control of...

AP Photo 7 hours ago

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, shakes hands after speaking at the Kent County Lincoln Day Dinner, Monday, Feb. 20, 2012, in Grand Rapids, Mich.

AP Photo 7 hours ago

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum kisses his wife, Karen, after speaking at the Kent County Lincoln Day Dinner, Monday, Feb. 20, 2012, in Grand Rapids, Mich.

AP Photo 8 hours ago

Republican presidential candidate, former House Speaker Newt Gingrich waits to be introduced during a campaign stop on Monday, Feb. 20, 2012 in Oklahoma City, Okla.

AP Photo 8 hours ago

Republican presidential candidate, former House Speaker Newt Gingrich waits to be introduced during a campaign stop at the Jim Thorpe Museum on Monday, Feb. 20, 2012 in Oklahoma City.

AP Photo 8 hours ago

Republican presidential candidate, former House Speaker Newt Gingrich tours the Jim Thorpe Museum during a campaign stop on Monday, Feb. 20, 2012 in Oklahoma City, Okla.

AP Photo 8 hours ago

Republican presidential candidate Ron Paul, a GOP congressman from Texas, speaks during a North Dakota Republican district convention on Monday, Feb. 20, 2012, at the Shiloh Christian School in Bismarck, N.D. Paul spoke in Bismarck Monday night during the final stop of a two-day, four-city...

AP Photo 8 hours ago

Republican presidential candidate Ron Paul, a GOP congressman from Texas, waits for his turn on the stage during a North Dakota Republican district convention on Monday, Feb. 20, 2012, at the Shiloh Christian School in Bismarck, N.D. Paul spoke in Bismarck Monday night during the final stop...

AP Photo 8 hours ago

North Dakota U.S. Rep. Rick Berg, R-N.D. , who is running for the North Dakota Republican endorsement for U.S. Senate, speaks on Monday, at the Shiloh Christian School in Bismarck, N.D. Attendees listened to speeches from North Dakota candidates for statewide office, and to remarks by Republican...

AP Photo 9 hours ago

Republican presidential candidate Rep. Ron Paul, R-Texas, takes leave of the crowd after speaking at the Bismarck Republican Convention, in Bismarck, N.D. , Monday, Feb. 20, 2012.

AP Photo 9 hours ago

Republican presidential candidate Rep. Ron Paul, R-Texas, addresses the Bismarck Republican Convention, in Bismarck, N.D. , Monday, Feb. 20, 2012.

AP Photo 9 hours ago

Xiaoxiao Lund, left, and her husband Cory Lund, right, of Bottineau, N.D. , wait in the Shiloh Christian School gymnasium in Bismarck, N.D. , for the appearance of Republican presidential candidate Ron Paul during a North Dakota legislative district convention on Monday, Feb. 20, 2012. ...

AP Photo 9 hours ago

Republican presidential candidate Rep. Ron Paul, R-Texas, speaks to supporters at the Bismarck Republican Convention, in Bismarck, N.D. , Monday, Feb. 20, 2012.

AP Photo 9 hours ago

Republican presidential candidate Rep. Ron Paul, R-Texas, walks onto the stage at the Bismarck Republican Convention, in Bismarck, N.D. , Monday, Feb. 20, 2012.

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US Republican Senator John McCain looks on during a press conference in Cairo on February 20, 2012. Egypt says it is working 'diligently' to resolve a bitter row with Washington over alleged illicit funding of NGOs for which American and other activists are due to stand trial, McCain said.

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US Republican Senator John McCain addresses a press conference in Cairo on February 20, 2012 during an official visit by a delegation of US senators to Egypt. Egypt says it is working 'diligently' to resolve a bitter row with Washington over alleged illicit funding of NGOs for which...

AP Photo 10 hours ago

Democrat Senate hopeful Elizabeth Warren chats with supporter Joe Buckley of Stoneham, Mass. as she tours small businesses in Stoneham, Monday, Feb. 20, 2012. She is seeking the U.S. Senate seat held by Republican Scott Brown.

AP Photo 10 hours ago

Democrat Senate hopeful Elizabeth Warren, middle left, walks with supporters as she tours small businesses in Stoneham, Mass. , Monday, Feb. 20, 2012. She is seeking the U.S. Senate seat held by Republican Scott Brown.

AP Photo 10 hours ago

Democrat Senate hopeful Elizabeth Warren pets "Bits" held by supporter Fred LaRiccia, left, as she tours a small business in Stoneham, Mass. , Monday, Feb. 20, 2012. She is seeking the U.S. Senate seat held by Republican Scott Brown.

AP Photo 10 hours ago

Democrat Senate hopeful Elizabeth Warren is hugged by a supporter as she tours a small business in Stoneham, Mass. , Monday, Feb. 20, 2012. Warren is seeking the U.S. Senate seat held by Republican Scott Brown.

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COLOGNE, GERMANY - FEBRUARY 20: A carnival float showing president of the U.S. Barack Obama as comic hero figure 'Captain America' displaying U.S. financial crisis attends the Rose Monday parade on February 20, 2012 in Cologne, Germany. Rose Monday is the highpoint of the Carnival...

AP Photo 11 hours ago

Democrat Senate hopeful Elizabeth Warren kneels on the sidewalk to talk to Zachary Anderson, 7, as she tours small businesses in Stoneham, Mass. , Monday, Feb. 20, 2012. She is seeking the U.S. Senate seat held by Republican Scott Brown.