With most of the ballot papers counted, Mr Romney won 46 per cent of the vote to closest rival Newt Gingrich’s 32 per cent, in what was the largest of the four states to hold Republican presidential contests so far this year.
At a rally following the victory, Mr Romney used the platform to turn his focus onto criticising President Barack Obama.
“Leadership is about taking responsibility, not making excuses,” said Mr Romney. “Mr. President, you were elected to lead, you chose to follow, and now it’s time for you to get out of the way!”
Mr Gingrich put a brave face on when he took to the podium. “It is now clear that this will be a two-person race between the conservative leader Newt Gingrich and the Massachusetts moderate,” he said, and did not publicly congratulate his rival for his victory.