12 days remain until the primary election and the Democratic candidates in Pittsburgh's mayoral race met today for what is likely their last debate. Mayor Ed Gainey and Allegheny County Controller Corey O'Connor were asked if they would agree and to end negative ads. Both denied running any. The debate aired live this morning on KDKA Radio. If you missed it, listen to the entire debate at KDKA Radio dot com. Click on the Big K Morning Show.