Republican presidential candidates, from left, Rep. Ron Paul, R-Texas, former Pennsylvania Sen. Rick Santorum, former Massachusetts Gov. Mitt Romney and former House Speaker Newt Gingrich stand for the National Anthem before the start of a Republican presidential debate Wednesday, Feb. 22, 2012, in Mesa, Ariz. (AP Photo/Ross D. Franklin)

Associated Press
Republican presidential candidates, from left, Rep. Ron Paul, R-Texas, former Pennsylvania Sen. Rick Santorum, former Massachusetts Gov. Mitt Romney and former House Speaker Newt Gingrich stand for the National Anthem before the start of a Republican presidential debate Wednesday, Feb. 22, 2012, in Mesa, Ariz.  (AP Photo/Ross D. Franklin)
Republican presidential candidates, from left, Rep. Ron Paul, R-Texas, former Pennsylvania Sen. Rick Santorum, former Massachusetts Gov. Mitt Romney and former House Speaker Newt Gingrich stand for the National Anthem before the start of a Republican presidential debate Wednesday, Feb. 22, 2012, in Mesa, Ariz. (AP Photo/Ross D. Franklin)
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