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The bane of Bain for Romney?

Even while Mitt Romney's on vacation, his campaign is continuing to bracket President Obama when he hits the road.

In advance of the president's fundraisers in Chicago tonight, the Romney camp has produced a Web video noting how unemployment is up in Chicago and home prices are down there since Obama took office. "Obama isn't working," the Web video concludes.

But a rival campaign sends over opposition research that plays the Bain Capital card: The private equity firm that Romney once headed bought a Chicago-area-based medical diagnostics company -- renamed Dade International, which later became Dade Behring -- that ended up firing and relocating workers.

As Politico wrote in Jan. 2008 during Romney's first run for president:

Bain Capital and Goldman Sachs bought Dade International for about $450 million in 1994.

The firm quickly fired or relocated at least 900 workers. Over the next several years, it sunk increasingly into debt and laid off 1,000 workers.

In 2002 — after Romney had left Bain — it filed for Chapter 11 bankruptcy protection.

When FOX's Chris Wallace, in '08, asked Romney about these Dade International job losses, the Republican replied, "[I]f you're in the business world and you're trying to save a business that's in trouble, that you're not going to be successful 100% of the time." He added:

"And I'm very proud of the fact that we were successful many, many times. We grew jobs quite dramatically in many settings. But oftentimes, when an enterprise is in real trouble, you have to try and cut back to save it."

As he highlights his business background and zeroes in on Obama's economic record, Romney's work at Bain Capital -- a private equity firm that often made money by buying up companies and then laying off their workers -- has the potential to counter his perceived strength, just like it did in his failed 1994 Senate campaign against Ted Kennedy.