In a new website, web video and lengthy television ad set to air in battleground states, the Obama campaign assailed Romney's record at private equity firm Bain Capital.

 

The effort marked Obama's fiercest swipe yet at the presumptive Republican nominee's business background. Romney's former GOP opponents briefly targeted his Bain Capital days during the primary season, but abandoned that line of criticism amid condemnation from conservatives who claimed those candidates were betraying the party's free-market values.