Battle of the TV ads in US primary elections

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Opponents have criticised the money spent by Mitt Romney on the Republican primary elections in Florida, where he had a resounding victory.

He polled 46% of the vote, with his closest rival Newt Gingrich on 32%. Mr Romney spent more than US$15m in the last month alone, funding 13,000 television advertisements.

Mark Mardell reports from Florida.

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