Democrats are already in Charlotte today ahead of their big convention. In the meantime, President Obama has been on the offensive, pushing back against the Republicans' messages at their convention last week. Our Bobby Cuza is in Charlotte and has more.

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CHARLOTTE, N.C. -- If you missed the Republican convention in Tampa last week, President Obama has a recap for you.

"What they offered over those three days was an agenda that was better suited for the last century. It was a re-run. It could have been on Nick at Nite," said President Obama.

For the second day in a row, Obama - currently on a four-day, four-state campaign swing - called the Republicans ideas retreads, comparing them to trickle-down economics. And he told supporters at the University of Colorado-Boulder, he likes the term Obamacare.

"I don't mind if folks think I care. I do care. And I don't know exactly what the other side's proposing. I guess you could call it Romney-Doesn't-Care," said President Obama.

Romney, meanwhile, is hoping for a bump from last week's Republican convention. He didn't have any public appearances Sunday, but like Obama, he'll be campaigning heavily and pumping tens of millions of dollars worth of ads into a handful of swing states like Ohio, where he spoke Saturday. His surrogates argue Obama has failed on his promise to turn around the economy.

"I think next week in Charlotte, the President needs to explain why he didn't do what he said he was going to do," said Eric Fehrnstrom, Romney senior advisor.

In Charlotte, last-minute preparations were being made inside the Time Warner Cable Arena, where First Lady Michelle Obama and former President Bill Clinton will be among the featured speakers once the convention gets underway Tuesday. Thursday night, the convention moves to Bank of America stadium for Obama's speech, where he'll try to recapture the excitement he generated among the party faithful at a similar football stadium the last time around in Denver.

Before arriving in Charlotte midweek, President Obama has campaign stops scheduled in Ohio and Virginia, with a break Monday to tour damage caused by Hurricane Isaac. Meanwhile, Republican Vice Presidential candidate Paul Ryan will be in Greenville, North Carolina Tuesday - about 230 miles from here - hoping to divert some media attention away from the Democrats.