by Reuters
With time running out, rivals of surging Republican Rick Santorum raised doubts about his conservative record on Monday in hopes of heading off a last-minute victory by the former senator a day before Iowa kicks off the 2012 presidential election season.
Santorum, a second-tier candidate until a jump in the polls last week, claimed the momentum as he and the other Republican candidates barnstormed across Iowa making final arguments and trying to bolster turnout ahead of Tuesday's Iowa caucuses.
Former Massachusetts Governor Mitt Romney and libertarian congressman Ron Paul are neck-and-neck in the lead in Iowa polls in the start of the fight to decide who will face Democratic President Barack Obama in next November's election.
But Santorum, uniting voters on the Christian right who have been divided for months, could pull off a surprise. The top three or four finishers will likely have momentum, and maybe more money, to go into next week's New Hampshire primary.
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