NEW ORLEANS — A Democratic consultant who worked for a rival presidential campaign paid a New Orleans magician to use artificial intelligence to impersonate President Joe Biden for a robocall that is now at the center of a multistate law enforcement investigation, according to text messages, call logs and Venmo transactions the creator shared with NBC News. Paul Carpenter says he was hired in January by Steve Kramer — who has worked on ballot access for Democratic presidential candidate Dean Phillips — to use AI software to make the imitation of Biden’s voice urging New Hampshire Democrats not to vote...