4 January 2012
Last updated at 23:22 ET
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John McCain: “We will catapult Mitt Romney to the White House”
The remaining candidates vying for the US Republican presidential nomination have begun a week of campaigning ahead of New Hampshire primary.
Iowa loser Michele Bachmann dropped out of the race on Wednesday, but Texas Governor Rick Perry vowed to fight on.
Iowa victor Mitt Romney unveiled 2008 nominee John
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