WASHINGTON (AP) -- 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 an ad run by the pro-Obama group Priorities USA Action, Romney says, quote, "I don't know what happened to a campaign of hope and change. I thought he was a new kind of politician."

Romney says on Bill Bennett's "Morning in America" radio show Thursday that Obama has been airing factually incorrect charges. Yet, he says the ads "just keep on running" and officials "just blast ahead."

Romney campaign spokeswoman Andrea Saul labeled the ad linking Romney to a woman's death "despicable." But the Obama campaign refused to pull the TV spot off the air.