DES MOINES -- Mike Huckabee has ordered his staff to cancel a negative ad that had already been delivered to television stations, he told members of the media at a news conference. The candidate, who spent the morning jogging and visiting volunteers at his downtown Des Moines headquarters, then proceeded to show the ad anyway.

Huckabee has lately been taking a harder line against Romney. The ad hit Romney on several issues, including crime and abortion. Need proof that he's serious? Look no farther than The Page:

Photo credit: Mark Halperin