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.

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.

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.