President Obama received a warm welcome at Scranton High School in Scranton, Pa., Wednesday. A surge in Hispanic voters in that state could make his chances of winning it a little more likely. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

From left, GOP presidential candidates Newt Gingrich, Ron Paul, Rick Perry and Mitt Romney participate in the Fox News/Google GOP debate at the Orange County Convention Center in September. Since then, the candidates have gotten tougher on each other. Mark Wilson/Getty Images hide caption

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Rep. Ron Paul. Patrick Smith/Getty Images hide caption

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Republican presidential candidate, Herman Cain campaigned Wednesday in Dayton, Ohio. He told a Fox News interviewer he would decide in the next week whether to stay in the GOP race. Al Behrman/AP hide caption

itoggle caption Al Behrman/AP

Republican presidential candidate Newt Gingrich addressed large crowds at campaign stops like this one at Tommy's Ham House in Greenville, S.C. on Wednesday. Richard Shiro/AP hide caption

itoggle caption Richard Shiro/AP