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“All of these states are close contests that have all been trending our way,” Mr. Madden said. “A number of these states show that Obama is still under 50 percent, which is terrible news for an incumbent president. We’re seeing much more enthusiasm on our side as well, so we have more room to grow our vote in these states and win them.”

But David Damore, University of Las Vegas political science professor, said the Romney camp could be overselling its hand here in Nevada, which has a higher unemployment rate than any other state and home to one of the nation’s hardest-hit housing markets.

“Besides the rhetoric from the Romney campaign, there is not much to suggest that he is gaining ground here,” Mr. Damore said. “The Democrats smoked the GOP in voter registration … and the Republicans are getting worked over in early voting.”

Mr. Damore pointed out that Gov. Brian Sandoval, a Republican, has been out of the country during Mr. Romney’s past two visits, and that one of Mr. Sandoval’s top political advisers made matters worse Tuesday when he predicted — while Mr. Romney campaigned in the state — that Mr. Obama would carry the state come Election Day.