MIAMI BEACH, Fla. -- President Barack Obama and Vice President Joe Biden unleashed a back-to-back assault yesterday on Republican challenger Mitt Romney, re-emphasizing Democratic assertions that Romney as a venture capitalist sent U.S. jobs overseas and paid no heed to the impact on American workers.

"You've got to give Mitt Romney credit," Biden said while campaigning in Iowa. "He's a job creator in Singapore, China, India."

Obama, who was fundraising in Atlanta and Miami, cast his Republican rival as the type of wealthy investor whose only goal was making money no matter the cost.

"His basic vision is one in which if wealthy investors like him, folks at the very top, are freed up from any kind of regulations, if they are maximizing their profits, even if they are polluting more, or offshoring jobs or avoiding taxes or busting union, whatever the strategy is -- if they are doing well, then everybody else is automatically doing well," Obama told a crowd of Atlanta donors.

Behind the criticism of Romney's business record is the Obama campaign's belief that the effort to undermine a potential Romney strength, his experience as the successful head of the private equity firm Bain Capital, is yielding results and raising questions with voters.

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Biden made note of news reports that Bain took over firms that sent jobs to China and India and opposed union efforts to increase wages and improve benefits. The Romney campaign has argued that the reports aren't accurate and don't take into account how work done overseas supports U.S. exports.

"The president and I don't see American workers as part of the problem. We see them as the heart of the solution," Biden said.

Romney campaign spokeswoman Andrea Saul called Biden's comments misleading and said they were an effort to distract voters from Obama's "disastrous economic record."

"President Obama has failed to meet his own standard for lowering unemployment because he has no idea what it takes to get our economy moving again," Saul said in a statement. "On Day One, Mitt Romney will take action to jump-start our economy and give job creators the incentives they need to thrive here in America."