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Mitt Romney (left) and Rick Santorum

Republican presidential candidates crisscross the state looking for votes. Our Elizabeth Brackett followed Rick Santorum to downstate Dixon, Illinois. Elizabeth and Carol Marin take a look at Tuesday's primary.

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On Wednesday night, the remaining four GOP presidential hopefuls had their 20th debate. Did Rick Santorum solidify his surge or did Mitt Romney seize much-needed momentum? Northwestern's Jason DeSanto is here to help us keep score.

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Republican candidate Rick Santorum has made a clean sweep in the last three primaries. With Super Tuesday now less than a month away -- what's next for the campaign? Carol Marin and her panel tell us.