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Several polls out Monday also included warning signs for Mr. Romney as he heads into the stretch run of the race. Gallup showed that Mr. Obama received a big post-convention bounce and expanded his lead in a daily tracking poll to 5 percentage points. CNN/ORC International also released a poll that showed Mr. Obama held a 52 percent to 46 percent lead over Mr. Romney among likely voters nationwide.

The Romney camp said it wasn’t worried.

“Don’t get worked up about the latest polling,” said Neil Newhouse, the campaign’s pollster. “While some voters will feel a bit of a sugar-high from the conventions, the basic structure of the race has not changed significantly. The reality of the Obama economy will reassert itself as the ultimate downfall of the Obama presidency, and Mitt Romney will win this race.”

With that as a backdrop, Mr. Romney tried some new material on the stump, including mocking Mr. Obama’s slogan, which Democrats used repeatedly at their convention.

“‘Forward’ is his campaign slogan,” Mr. Romney said. “I think ‘Forewarned’ is a better term.”

The Romney campaign also used the stop here to draw attention to Mr. Obama’s 2013 budget, which proposed eliminating the C-27J transport aircraft, several of which are housed with the 179th Airlift Wing of the Ohio Air National Guard.

“Unfortunately, President Obama made the decision to end the mission of the 179th,” said Sen. Rob Portman, who flew into Ohio aboard the Romney campaign plane after helping him prepare for debates this fall with the president. “Ladies and gentlemen, I will continue to fight that decision and fight for a commander in chief who believes we need a strong military in this country and we can’t afford those cuts.”