US Republican presidential candidate Mitt Romney is the front-runner to challenge Barack Obama for the Presidency after securing the swing state of Ohio on Tuesday night.
Romney cruised to victory in his home state of Massachusetts, as well as in Idaho, Vermont, Alaska and Virginia on 'Super Tuesday'.
He is now ahead of rivals Ron Paul, Rick Santorum and Newt Gingrich in the battle for the Republican nomination.
Santorum won a hat-trick of contests, while Newt Gingrich took his home state of Georgia.
The eventual nominee will be crowned at the Republican convention in August before challenging Barack Obama in November's election.
At a Republican event in Boston, Romney said: "I'm going to get this nomination."
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