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Still, he said there are other reasons for those voters to show up at the polls in November, saying that a low turnout of evangelical and pro-life voters would leave conservatives “wiped out downstream, i.e., the conservative ‘farm team’ of mayors, city councilmen, county commissioners” who will also be on the ballot.

GOP pollster Whit Ayres said all the evidence he sees indicates Republicans are more excited about the election — maybe not for Mr. Romney but in opposition to Mr. Obama. The court’s ruling, which labeled the heart of Mr. Obama’s law a tax, will simply fire them up more.

“Now Obama has to defend a significant tax increase that is part of an unpopular law that 60 percent of voters, before the Supreme Court decision, had believed will increase their taxes, health care costs, insurance premiums and the national deficit,” Mr. Ayres said.