President Obama’s decision to abandon his legal support for the Defense of Marriage Act has generated only mild rebukes from the Republicans hoping to succeed him in 2012, evidence of a shifting political climate in which social issues are being crowded out by economic concerns.

The Justice Department announcedon Wednesday that after two years of defending the law — hailed by proponents in 1996 as an cornerstone in the protection of traditional values — the president and his attorney general have concluded it is unconstitutional.

In the hours that followed, Sarah Palin’s Facebook site was silent. Mitt Romney, the former governor of Massachusetts, was close-mouthed. Tim Pawlenty, the former governor of Minnesota, released a Web video — on the labor union protests in Wisconsin — and waited a day before issuing a marriage statement saying he was “disappointed.”

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