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Mr. Ryan, meanwhile, is scheduled to campaign in Greenville, N.C., on Monday – a day before the Democratic convention starts in the state.

On Saturday, Mr. Boehner whipped up the crowd into a frenzy before introducing Mr. Romney, arguing that it is time for “America to stand up and reclaim our country” and the newly minted GOP presidential nominee is the right person to lead the way. “He is a person who will keep his promises,” he said. “You and I will send Barrack Obama packing his bags back to Chicago.”

The Republican nominee also released his second weekly podcast of the campaign, in which he continued to make the case that Mr. Obama’s soaring rhetoric from four years ago has come crashing down to Earth.

“President Obama promised to begin to slow the rise of the oceans and to heal the planet. My promise … is to help you and your family,” Mr. Romney said, repeating a line from his acceptance speech last week in Tampa.

The president’s political trip will include stops in Colorado, Ohio and Virginia. His schedule also includes a planned visit Monday to the Gulf Coast to survey the damage from Hurricane Isaac — three days after Mr. Romney toured a small town that felt the brunt of the storm in Louisiana, teaming up with Gov. Bobby Jindal and Sen. David Vitter, fellow Republicans.

In Iowa, the president was accompanied by Sen. Tom Harkin, Iowa Democrat, who said wealthy Republican donors such as Sheldon Adelson and the Koch brothers were trying to buy the election with multi-million-dollar contributions to third-party advocacy groups attacking Mr. Obama.

“They’re not going to buy this election, and they’re not going to buy America,” Mr. Harkin told the crowd.

Mr. Obama’s lead in polls over Mr. Romney in Iowa has narrowed to a statistical tie in recent weeks, and some of the president’s supporters are worried.

“There’s a different vibe than 2008,” said Deena Wells of Des Moines, who works at an insurance company. “People want to hear a plan.”

She said some friends and colleagues have soured on the president.

“We were all on the same page four years ago,” she said. “But things have changed. They say, ‘I haven’t really seen what he’s done.’ “