The campaign trail in South Carolina (31 images)

With the crucial Republican presidential primary to be held on Saturday, Jan. 21. Newt Gingrich has suddenly challenged the previously presumptive nominee Mitt Romney to the point at which the two are neck and neck in the polls.

Children hold a poster of Mitt Romney outside of his camping headquarter in Greenville, South Carolina on January 21, 2012. Romney is making his final push as early poll numbers show his lead is slipping to Newt Gingrich. UPI/Kevin Dietsch..

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Audience members watch as Republican presidential candidate Newt Gingrich speaks at a barbeque rally in Waterloo, South Carolina on January 19, 2012. South Carolina will hold it's primary on Saturday, January 21. UPI/Kevin Dietsch

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Republican presidential candidate Newt Gingrich speaks at a barbeque rally in Waterloo, South Carolina on January 19, 2012. South Carolina will hold it's primary on Saturday, January 21. UPI/Kevin Dietsch

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A picture of Republican Presidential candidate Mitt Romney is seen on the wall of his campaign headquarter in Greenville, South Carolina on January 21, 2012. Romney is making his final push as early poll numbers show his lead is slipping to Newt Gingrich. UPI/Kevin Dietsch..

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