Rick Santorum cruised to victory in the Louisiana Republican presidential primary but still trails Mitt Romney by a wide margin in the national delegate count for the party nomination.
As Mitt Romney sought to land a knockout blow against Rick Santorum in the race for the Republican US presidential nomination, the difficulty of a general election matchup against US Democratic President Barack Obama became clearer.
Mitt Romney made a leap toward winning the Republican presidential nomination with a clean sweep of Wisconsin and two other primaries that handed a heavy defeat to main rival Rick Santorum.
US Republicans Mitt Romney, Rick Santorum and Newt Gingrich faced off in a pair of high-stakes Deep South presidential primaries, and early results showed very tight races in both Mississippi and Alabama.
US Republican presidential hopeful Rick Santorum told Puerto Ricans they would have to make English their primary language if they want to pursue US statehood, a statement at odds with the US Constitution.
Republican Mitt Romney cruised to an easy victory over top rival Rick Santorum in Illinois on Tuesday, moving him one step closer to clinching the party's volatile battle for the presidential nomination.
US Republican presidential candidate Mitt Romney accused rival Rick Santorum of trying to "kidnap" Michigan's Republican presidential contest as he faced the possibility of a humiliating defeat in the Rust Belt state where he grew up.
Rivals Mitt Romney and Rick Santorum made their final pitch for support in the vital battleground state of Ohio, the day before 10 states hold Super Tuesday nominating contests that could be pivotal in an unpredictable Republican presidential race.
Mitt Romney notched early wins as he fought to establish his dominance in the race for the Republican US presidential nomination but looked unlikely to score a knockout blow that would force any of his rivals from the contest.
Mitt Romney took a crucial step toward the Republican presidential nomination as he scored a solid victory in New Hampshire despite blistering attacks on his record as a businessman.
Real estate mogul Donald Trump re-injected himself and his wealth into the Republican presidential race by endorsing Mitt Romney, a day after the front-runner stumbled with remarks suggesting he was indifferent to US' poor.
Rivals heaped criticism on surprise front-runner Rick Santorum in a debate among Republican presidential candidates, hoping to stall his surge at a pivotal period in the 2012 campaign.