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Pictures | Thu Feb 23, 2012 | 8:59pm EST

Romney edges back into White House race, assails Santorum

Republican presidential candidate former Senator Rick Santorum listens as former Massachusetts Governor Mitt Romney (R) speaks during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012.  REUTERS/Joshua Lott (

Republican presidential candidate former Senator Rick Santorum listens as former Massachusetts Governor Mitt Romney (R) speaks during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott (

Republican presidential candidate former Senator Rick Santorum listens as former Massachusetts Governor Mitt Romney (R) speaks during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott (
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Republican presidential candidates former Senator Rick Santorum and former Massachusetts Governor Mitt Romney (R) laugh as they shake hands at the conclusion of the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott

Republican presidential candidates former Senator Rick Santorum and former Massachusetts Governor Mitt Romney (R) laugh as they shake hands at the conclusion of the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012....more

Republican presidential candidates former Senator Rick Santorum and former Massachusetts Governor Mitt Romney (R) laugh as they shake hands at the conclusion of the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott
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Republican presidential candidate former U.S. Senator Rick Santorum speaks as former Massachusetts Governor Mitt Romney (R) looks on during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012.   REUTERS/Joshua Lott

Republican presidential candidate former U.S. Senator Rick Santorum speaks as former Massachusetts Governor Mitt Romney (R) looks on during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott

Republican presidential candidate former U.S. Senator Rick Santorum speaks as former Massachusetts Governor Mitt Romney (R) looks on during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott
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Republican presidential candidate former U.S. Senator Rick Santorum and former Massachusetts Governor Mitt Romney (R) discuss an issue during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012.    REUTERS/Joshua Lott

Republican presidential candidate former U.S. Senator Rick Santorum and former Massachusetts Governor Mitt Romney (R) discuss an issue during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott

Republican presidential candidate former U.S. Senator Rick Santorum and former Massachusetts Governor Mitt Romney (R) discuss an issue during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott
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REFILE - CORRECTING ACTION CARRIED OUT BY PRESIDENTIAL CANDIDATES
U.S. Republican presidential candidates (L to R) U.S. Rep. Ron Paul, former U.S. Senator Rick Santorum, former Massachusetts Governor Mitt Romney and former Speaker of the House Newt Gingrich sing the national anthem before the start of the Republican presidential debate in Mesa, Arizona, February 22, 2012. REUTERS/Laura Segall

REFILE - CORRECTING ACTION CARRIED OUT BY PRESIDENTIAL CANDIDATES U.S. Republican presidential candidates (L to R) U.S. Rep. Ron Paul, former U.S. Senator Rick Santorum, former Massachusetts Governor Mitt Romney and former Speaker of the House Newt...more

REFILE - CORRECTING ACTION CARRIED OUT BY PRESIDENTIAL CANDIDATES U.S. Republican presidential candidates (L to R) U.S. Rep. Ron Paul, former U.S. Senator Rick Santorum, former Massachusetts Governor Mitt Romney and former Speaker of the House Newt Gingrich sing the national anthem before the start of the Republican presidential debate in Mesa, Arizona, February 22, 2012. REUTERS/Laura Segall
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U.S. Republican presidential candidates former U.S. Senator Rick Santorum (L) and former Massachusetts Governor Mitt Romney smile before the start of the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Laura Segall

U.S. Republican presidential candidates former U.S. Senator Rick Santorum (L) and former Massachusetts Governor Mitt Romney smile before the start of the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Laura...more

U.S. Republican presidential candidates former U.S. Senator Rick Santorum (L) and former Massachusetts Governor Mitt Romney smile before the start of the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Laura Segall
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Republican presidential candidate former U.S. Senator Rick Santorum waves before the start of the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Laura Segall

Republican presidential candidate former U.S. Senator Rick Santorum waves before the start of the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Laura Segall

Republican presidential candidate former U.S. Senator Rick Santorum waves before the start of the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Laura Segall
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Republican presidential candidate former Massachusetts Governor Mitt Romney waves before the start of the Republican presidential candidate debate in Mesa, Arizona, February 22, 2012.  REUTERS/Laura Segall

Republican presidential candidate former Massachusetts Governor Mitt Romney waves before the start of the Republican presidential candidate debate in Mesa, Arizona, February 22, 2012. REUTERS/Laura Segall

Republican presidential candidate former Massachusetts Governor Mitt Romney waves before the start of the Republican presidential candidate debate in Mesa, Arizona, February 22, 2012. REUTERS/Laura Segall
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U.S. Republican presidential candidates U.S. Rep. Ron Paul (R-TX) (L) and former U.S. Senator Rick Santorum shake hands as former Massachusetts Governor Mitt Romney and former Speaker of the House Newt Gingrich applaud before the start of the Republican presidential debate in Mesa, Arizona, February 22, 2012.   REUTERS/Joshua Lott

U.S. Republican presidential candidates U.S. Rep. Ron Paul (R-TX) (L) and former U.S. Senator Rick Santorum shake hands as former Massachusetts Governor Mitt Romney and former Speaker of the House Newt Gingrich applaud before the start of the...more

U.S. Republican presidential candidates U.S. Rep. Ron Paul (R-TX) (L) and former U.S. Senator Rick Santorum shake hands as former Massachusetts Governor Mitt Romney and former Speaker of the House Newt Gingrich applaud before the start of the Republican presidential debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott
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