Delaware Senate candidates Chris Coons and Christine O'Donnell faced off in their first debate on Wednesday night, a feisty exchange on issues ranging from evolution to Afghanistan to gays serving in the military to whether China is planning to take over the United States.SATURDAY NIGHT LIVE: Right off the bat, moderators Wolf Blitzer of CNN and Nancy Karibjanian of Delaware First Media tried to spark controversy, asking Democrat Coons to respond to some of the controversies surrounding his opponent.