Obama stands by hits on Romney's Bain Capital days

President Barack Obama on Monday defended his criticism of presumptive Republican presidential Mitt Romney's ties to the private equity firm Bain Capital, saying it was rightly part of the campaign debate because Romney himself was emphasizing his business background.

Romney's Bain playbook unclear as attacks grow

The core of his presidential candidacy under attack, Mitt Romney has yet to shape a playbook to defend a quarter-century in the business world that created great riches for himself and great hardship, at times, for some American workers.