Rick Santorum

Unable to replicate the success he had in 2012, the former Pennsylvania senator is instead throwing his support behind fellow Republican Marco Rubio.

Critics say Iowa and New Hampshire are too old, too white and too small to have so much power in the presidential nominating process. There are lots of other ideas, but tradition is hard to change.

The onetime Iowa caucus winner now sits dead last in the state's polls, but Rick Santorum says he's still hoping for another last-minute surge.

Politics is never far from controversy — be it Supreme Court rulings, guns or terrorist attacks, like the one in Paris. President Obama — and the candidates trying to replace him — all weighed in.

The New Jersey governor tried to make Hillary Clinton the target at every turn, but a feisty Bobby Jindal attacked Christie's record and tried to argue that he is the most conservative choice.

There will be a renewed focus on a surging Ben Carson, while Jeb Bush needs a strong performance during the debate — which is focused on the economy — to assuage nervous donors.

Rick Santorum, Bobby Jindal, George Pataki and Lindsay Graham tried to make the best of it as they were relegated, yet again, to an earlier debate instead of the main primetime stage.

There are more Catholic Republicans than ever running for president, but not all have embraced Pope Francis' more liberal statements and theology.

Republican presidential debates are divided into two tiers, based on where candidates appear in the polls. The lower tier has dwindled to just four candidates in Wednesday night's debate.

Rick Perry, Bobby Jindal, Carly Fiorina, Rick Santorum, Lindsey Graham, George Pataki and Jim Gilmore didn't make the prime-time debate. Instead, they took shots at the people they wanted to debate.

Since the Supreme Court's Citizens United decision, money in politics has exploded. To make it in the 2016 presidential race, candidates need their own billionaire. Here's who's lining up with whom.

With this many candidates running for the White House, gaffes are inevitable. This week, Republican presidential contenders Ted Cruz, Mike Huckabee and Rand Paul have all fallen victim.