Dem super-PAC ad attacks Romney's Bain years

The ad comes a day after President Obama's campaign attacked Romney on the issue, leading to a day of back-and-forth over whether Romney had created jobs or axed them. The ad is part of a multimillion-dollar buy that is running in the swing states of Florida, Pennsylvania, Ohio, Virginia and Colorado.

"With Romney and Bain Capital, the objective was to make money. Whether the companies they came in and worked with made money or not was irrelevant — Bain Capital always made money," said Pat Wells, a steelworker whose plant was closed a few years after Bain took it over. "If we lost, they made money. If we survived they made money. It's that simple."

The ad then pivots to the present. "He promised us the same things he's promised the United States. He'll give you the same thing he gave us — nothing," Wells said. "He'll take it all."

Romney argues his time at Bain shows he'd be a better steward of the economy than Obama, whom Republicans say has done little to create jobs. Romney's campaign released an ad Monday touting an Indiana steel company turned around by Romney and Bain after its purchase. 

The dueling messages point to the need for both campaigns to define Romney; a New York Times/CBS poll released Monday found nearly one-third of voters don't have an opinion of the presumptive GOP nominee.