Obama said that McCain's response to the limping economy doesn't offer enough to Americans worried about keeping their jobs, their homes and their lifestyles.
"Instead of commonsense solutions, month after month, they've offered little more than willful ignorance, wishful thinking, outdated ideology," he said in a steamy gymnasium at Palm Beach Community College, where 1,700 people sat cheering in the stands and at least that many if not more gathered outside to cheer Obama's appearance.
The McCain campaign shot back that Obama's stimulus plan, which includes sending billions to state and local governments to keep projects and health spending afloat, isn't the right recipe.
"When Americans are hurting, Barack Obama's plan to take more and more money from pocketbooks and hand it over to mismanaged government budgets is not the solution - it's the problem," said McCain spokesman Tucker Bounds. "Barack Obama is simply offering more of the same."
Obama flew in the Democratic governors of several other states, besides Florida, that went Republican four years ago and for which the Democratic presidential nominee is making a serious play this time around. During the roundtable discussion, Obama hammered home the message that he has the best economic plan - and all the participants agreed.
Along the long table talking economic policy for 95 minutes were the governors of Michigan, Ohio, New Mexico and Colorado, as well as Google Chairman and CEO Eric Schmidt, former Federal Reserve Chairman Paul Volcker, an Obama campaign adviser, and local business owners.
With the current economic crisis creating favorable conditions for Democrats, Obama has focused his final-stretch message almost entirely on that topic - and almost entirely on traditionally Republican turf. The subject of the battered economy, and battered households, is particularly timely in Florida, which has unemployment above the national average and one of the worst foreclosure rates.
Florida, once solidly in McCain's corner, now is a tossup. In Colorado and Ohio, McCain is believed to be down, but within or close to the margin of error in polls. Obama appears to have a comfortable lead in New Mexico.
And in Michigan, the only state of the four represented at Obama's event to go Democratic last time, McCain recently withdrew all staff and ads.
Obama is on a two-day swing through Florida, finishing Tuesday evening with a large rally with his wife, Michelle, in Miami.
Obama also campaigned across the state on Monday, holding a solo rally in Tampa and a joint event with former Democratic rival Hillary Rodham Clinton in Orlando that was attended by more than 50,000 people.
The Democratic presidential candidate is to head to more GOP states, Virginia and Indiana, on Wednesday and Thursday.
After a morning rally Thursday in Indianapolis, Obama planned to leave the campaign trail and fly to Hawaii to visit his gravely ill 85-year-old grandmother, Madelyn Dunham, a central figure in her grandson's life. She helped raise him.
He is to resume campaigning Saturday in an undetermined location in the West, mostly likely another state that went for Bush in 2004, such as Nevada, aides said.
For election night, Obama planned an event at Chicago's Grant Park on Hutchinson Field, his campaign announced Tuesday.