A poll shows Rick Santorum with a comfortable lead over Mitt Romney in Saturday’s Louisiana primary, as his GOP rivals jumped on remarks he made about President Obama.

CNN projects Rick Santorum will win the primaries in Alabama and Mississippi, shutting out Newt Gingrich in his home region for the night. FULL STORY

It’s nearly impossible for Mitt Romney’s rivals to catch him, his campaign says. Rick Santorum and Newt Gingrich disagree.

White House hopeful Mitt Romney has won the crucial state of Ohio in the 10 Super Tuesday polls after a tightly-fought contest with his main rival Rick Santorum.

Mitt Romney and Rick Santorum went after each other in the final debate before primaries in Arizona and Michigan — and before Super Tuesday. FULL STORY

Facing new questions about the strength of his candidacy, Mitt Romney said he's prepared to change his approach against resurgent GOP rival Rick Santorum.

After rival Rick Santorum’s sweep in this week’s contests, Newt Gingrich is looking to revitalize his campaign with a strong showing on Super Tuesday next month.

It’s a bad night for Mitt Romney so far. Rival Rick Santorum will win Minnesota’s caucuses and Missouri’s nonbinding primary, CNN projects. Colorado’s delegates are up for grabs. FULL STORY

Rick Santorum has easily won Minnesota’s Republican caucuses, raising fresh questions about the strength of support for frontrunner Mitt Romney.

With momentum from a delayed Iowa win, Rick Santorum sought to weaken Mitt Romney and Newt Gingrich with direct attacks ahead of South Carolina’s voting.