WASHINGTON -- President Barack Obama's campaign is launching a new ad against Republican challenger Mitt Romney, building on Obama's attack against his rival's economic record as Massachusetts governor.

The ad picks up where a campaign commercial left off last week. It accuses Romney of leaving the state's debt and employment in worse condition than he found them. It says Romney presided over a state with the highest debt in the country and says it ranked 47th in the country in job creation. Romney was governor from 2003 to 2007.

The ad airs in Colorado, Florida, Iowa, North Carolina, New Hampshire, Nevada, Ohio, Pennsylvania and Virginia.

The ad is selective in its economic data. The Massachusetts economy improved slightly while Romney was governor but its average employment growth was among the nation's worst.

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