The projected wins give Mitt Romney more than half the delegates needed to clinch the GOP race, according to CNN’s count. FULL STORY

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.

By winning the territory, GOP hopeful Mitt Romney will be awarded 20 delegates, according to a CNN projection.

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.

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

As the Republican presidential campaign heads toward a critical showdown in the Florida primary, Mitt Romney is poised to score a victory over Newt Gingrich, according to a CNN survey of Sunshine State GOP political insiders.

With a healthy lead in the polls the day before the Florida primary, Mitt Romney is depicting Newt Gingrich as increasingly desperate in the GOP race.

Mitt Romney went after his surging rival Newt Gingrich early in the GOP presidential debate Monday, saying Gingrich was the only House speaker to resign in disgrace.

Newt Gingrich won Saturday’s South Carolina GOP presidential primary, marking a stunning turnaround for a candidate whose campaign had been left for dead — again — just weeks ago.

The primary is often a free-for-all, but this year’s contest may set a new standard for volatility, and insiders see a close finish, according to a CNN survey.