The three contests so far have had three different winners after Newt Gingrich's big victory in South Carolina and Iowa's Republican party declaring Rick Santorum the winner of the state's caucuses. Mitt Romney took New Hampshire, but the air of inevitability that surrounded his candidacy after that win is gone, at least for now.

Romney is acknowledging it's not been the best of weeks for his campaign after yesterday's loss to Newt Gingrich in the South Carolina primary. He tells Fox News it was a mistake not releasing his tax returns, so he'll do it Tuesday.

Meanwhile, Gingrich is declaring that he is the only Republican candidate who has what it takes to defeat President Barack Obama. In TV interviews this morning, the former House speaker said his conservative views and confrontational style are what's needed to fight Obama's "billion-dollar war chest."

Santorum tells CNN that he expects to do well in Florida's Jan. 31 primary and says he's under no pressure to quit the GOP presidential race. Santorum says the idea that conservatives need to rally around a single candidate to beat Mitt Romney is "objectively false," noting his victory in Iowa and Newt Gingrich's win in South Carolina.