CHARLOTTE, N.C. (AP, ABC7) - Democrats open their national convention Tuesday offering President Barack Obama as America's best chance to revive the ragged U.S. economy and asking voters to be patient with incomplete results so far.

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The stage is set and there's no shortage of enthusiasm in Charlotte. But confidence? That's another question

"I think the team wrestles with it,” says former Virginia Governor Tim Kaine, who is running for senate. “(2008) was so historic and there's no circumstance under which election could be as historic as the election in 08. And yeah there's a lot of challenges out there we're living in tough times."

So aside from the fanfare and flood of TV time pushing their platform, Democrats will count on these folks, delegates, like the 124 from Virginia to head back to their neighborhoods and spread the message.

Michelle Obama, in her opening-night speech, aims to give people a very personal reminder of "the man that he was before he was president."

"The truth is that he has grown so much, but in terms of his core character and value, that has not been changed at all," Mrs. Obama said in interview airing on SiriusXM's "The Joe Madison Show."

The three-day convention has drawn thousands of delegates to a state Obama narrowly carried in 2008.

And although Obama no longer is the fresh-faced newbie who leveraged a short Senate career into an audacious run for the nation's highest office, he still can excite partisans, and Democrats were counting on massive numbers to pack a stadium for his speech later in the week.

Virginia Sen. Mark Warner and a host of Democratic partisans worked to rev up delegate enthusiasm, saying Obama has a strong record to defend.

They noted the president had helped the economy rebound, presided over an increase in the stock market and brought troops home from Iraq and Afghanistan.

"We've got some truth telling to do," Warner told Florida delegates at a breakfast meeting. "America is better off today than it was four years ago when this president took over."

Newark, N.J., Mayor Cory Booker told the delegates Democrats need to get fully behind Obama, comparing the differences between a large voter turnout in his home state during the 2008 election and a more modest outpouring two years later, when his home state elected Republican Chris Christie as governor.

"Change is never made in a sedentary position," he said.

The Democrats dispatched U.S. Senate candidate Elizabeth Warren, who hopes to unseat Republican Scott Brown in Massachusetts, to make the case for Obama on morning talk shows, and she acknowledged that "it's tough out there" for many Americans.

But she insisted that Obama offers the better vision going forward. "Republicans are not helping us get back," she said.

Warren was up against GOP vice presidential candidate Paul Ryan, the Wisconsin congressman, who held out the millions of people who are struggling to find work as an indictment of the president's first term.

"Four years into a presidency and it's incomplete?" he asked in a round of morning television interviews. "The president is asking people just to be patient with him?"

GOP nominee Mitt Romney's campaign reinforced that message with a new Web video answering Obama's statement that "there are always going to be bumps on the road to recovery."

The new video showcases a series of ordinary people who've lost their jobs saying, "I'm an American, not a bump in the road."

Romney, his convention behind him, drove from his vacation home in New Hampshire to the Vermont home of former Massachusetts Lt. Gov. Kerry Healey to spend the day preparing for the fall debates with Obama.

Democrats released a party platform for ratification Tuesday that echoes Obama's call for higher taxes on the wealthy and reflects his shift on gay marriage by supporting it explicitly.

In a nod to dissenters on gay marriage, the platform expresses support for "the freedom of churches and religious entities to decide how to administer marriage as a religious sacrament without government interference."

As with the deeply conservative Republican platform, not all of which Romney endorses, nothing binds Obama to the specifics of the party's manifesto.