WILMINGTON, Del. — Democrat Chris Coons easily won Delaware's Senate race Tuesday over Republican Christine O'Donnell, a tea party favorite who struggled to shake old cable-show footage in which she spoke out against masturbation and talked about dabbling in witchcraft as a teenager.Based on an AP analysis of preliminary exit polling data, Coons defeated O'Donnell, an evangelical outsider whose stunning upset in the September GOP primary likely cost Republicans the race.