2012 Republican Presidential Candidate, Rick Santorum | featured news

The U.S. Senate's top Republican called on his party to unite behind leading presidential candidate Mitt Romney on Sunday as rival Rick Santorum vowed to stay in the race beyond a likely defeat in Tuesday's Wisconsin primary.

As he struggles to find a balance between being an underdog and an embittered also-ran, Rick Santorum has been trying to modulate the fiery language that has been a potent campaign weapon.

Former President George H.W. Bush plans to endorse Mitt Romney at an event Thursday in Houston... Formal backing from the 41st president is another sign that the Republican Party is uniting behind Romney as pressure builds on challengers Rick Santorum and Newt Gingrich to leave the race.

Rick Santorum won the Louisiana Republican presidential primary Saturday, beating front-runner Mitt Romney in yet another conservative Southern state.

Republicans went to the polls Saturday in Louisiana to vote in a primary poised to give a boost to Rick Santorum, but also add to Mitt Romney’s growing, if not insurmountable delegate lead in the race for the GOP nomination.

... the Romney campaign inadvertently gave Mr. Santorum a new supply when a senior adviser went on CNN and seemed to suggest that Mr. Romney’s conservative positions in the primary season could change like an Etch a Sketch drawing.

Even if Rick Santorum won the presidential preference vote in Tuesday's Illinois Republican primary -- and polls indicate that it's actually Mitt Romney who is the favorite -- he still could lose out in the delegate race.

Former Massachusetts Governor Mitt Romney may be headed for an important victory in Illinois on Tuesday that would help him put more distance between himself and Rick Santorum, his chief rival for the Republican presidential nomination.

The Republican primary process rolls on nearly eleven months after it kicked off in Iowa, and with no definitive end in sight. On Saturday, Missouri began its process of awarding delegates to presidential contenders and the campaigns of Mitt Romney and Rick Santorum each looked to win the more aggressively-contested primary in Puerto Rico on Sunday.

The Republican presidential contest next week gives the conservative a shot at seizing the momentum from front-runner Mitt Romney, who leads him there by just 4 points.After a pair of pivotal Southern tests, the Republican presidential race has become a battle between Mitt Romney's grind-it-out delegate arithmetic and Rick Santorum's popular momentum.