Mitt Romney is gambling by assuming that the whole of US has lurched further to the right

The choreography of the Washington tango – skip to the extremes during the primaries, tack to the centre once they're locked up – used to be routine. Expectations that a different Mitt Romney might suddenly emerge in the general election were all the greater, seeing as he had previously skidded around so much. The son of a respected Republican moderate, and a governor in liberal Massachusetts who put Obamaesque healthcare in place, he only veered off to the right when the courting of militant Republican activists demanded it.

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