CHICAGO (AP) — President Barack Obama's campaign is launching a new offensive against Republican Mitt Romney today, blasting the GOP nominee for criticizing Americans who don't pay income taxes without having "come clean" about his own.

The campaign starts the new push with a television advertisement, its first spot using Romney's comments that 47 percent of voters pay no income tax and believe they are victims. The ad begins airing today in Ohio but is also expected to be part of the campaign's final push elsewhere.

The ad's narrator says about Romney: "Maybe instead of attacking others on taxes, he should come clean on his."

The spot signals that Obama will keep making Romney's taxes a campaign issue.

The Republican has released only two years of tax information about his personal wealth.