Mitt Romney on USA Today

The Oregon Republican Party canceled plans for a debate next week after Mitt Romney and Rick Santorum bailed.

Mitt Romney wins the Arizona and Michigan primaries, defeating Rick Santorum and regaining his footing in the Republican presidential race.

The science of applying predictive analytics to Twitter is still in its infancy, analysts say.

Mitt Romney had a snappy rejoinder to Newt Gingrich's comment that he is a weak GOP front-runner.

Comedian Jeff Foxworthy jokes that hunting with Mitt Romney could be more dangerous than shooting for quail with Dick Cheney.

Barry Strauss: Today is the Ides of March, when Caesar was stabbed to death. Caution: friends are more dangerous than enemies.

The nation's largest public employee union is spending $500,000 to run ads against Republican Mitt Romney ahead of Tuesday's primary in Ohio.

Rick Santorum and Ron Paul battled for second place, while Newt Gingrich trailed.

The GOP presidential hopeful said he doesn't know how Obama "can sleep at night" knowing soldiers do not know what the mission is in the region.

With polls showing Mitt Romney and Rick Santorum in a dead heat ahead of Tuesday's primary, Ohio has become a battleground for GOP votes.

Facing new criticism and voter confusion, he says he can defend his Massachusetts health care reform and distinguish it from "Obamacare."

Mitt Romney, who has relied more on maxed-out donors than his presidential rivals, must find new sources of funding for his campaign.

Rick Santorum, Mitt Romney and Newt Gingrich have all been critical of President Obama's policy in the Middle East and his handling of Iran.

Mitt Romney won six of 10 Super Tuesday contests as Rick Santorum showed strength with wins in three states. Gingrich won Georgia.

Cal Thomas and Bob Beckel: They agree Romney's flaws are showing, but it's not too late to turn those negatives into positives.