Romney protests Obama ad linking him to cancer

Republican presidential challenger Mitt Romney is charging that President Barack Obama has gone beyond the bounds of acceptable campaign speech with a TV ad linking him to a woman's death from cancer.

Without directly citing the ad run by the pro-Obama independent group Priorities USA Action, Romney says, "I don't know what happened to a campaign of hope and change."

His comments came on Bill Bennett's "Morning in America" radio show Thursday.

In the ad, a steelworker suggests that Romney and the private equity firm he founded might bear some responsibility for his wife's death from cancer because the firm closed the plant and he lost his health insurance.

The Obama campaign refused to call on the group to pull the TV spot.