Scotland Tonight: The US presidential race

STV

Mitt Romney has cemented his status as the frontrunner in the race to become the Republican Party candidate in November's US Presidential Election.

He won a bitterly contested Florida primary with 64% ofthe vote, leaving closest rival Newt Gingrich trailing 14 points behind.

Scotland Tonight discussed where we are in the long battle for the Whitehouse, we're now joined by Dr Christopher Carman from Strathclyde Universit