US election 2012: Mitt Romney closes in on Rick Santorum

Newly flush with cash, the Red White and Blue Fund, a similar 'super PAC' backing Mr Santorum, has spent $1.3 million (£822,000) on his behalf in Michigan.

Official figures showed Mr Romney's campaign spent $18.8 million in January – almost three times as much as it raised – and that about half his donors have already given the maximum $2,500 (£1,580).

They prompted suggestions that he may be forced to dip into his own $250 million (£160 million) fortune to secure the party's candidacy to face Barack Obama in November.

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