Former GOP presidential nominee Mitt Romney struggled to distance himself from the health care program he implemented in Massachusetts. Now he has acknowledged it was a precursor to Obamacare. Gregory Bull/AP hide caption

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Gregory Bull/AP

Former Massachusetts Gov. Mitt Romney maintained his frontrunner status in the GOP presidential debate at Dartmouth College on Tuesday.

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Justin Sullivan/Getty Images

New Jersey Gov. Chris Christie turns to leave a news conference at the Statehouse in Trenton on Tuesday after he announced that he will not run for president in 2012.

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Mel Evans/AP