FORT DEFIANCE, Ariz. — At an elementary school way out in rural northeastern Arizona, on a sunny Saturday afternoon, the Incredible Hulk was signing autographs. Hulk was a huge draw in this remote community in Navajo Nation. Hundreds of people turned out for a chance to meet him — well, the actor who plays him in the latest Marvel movies, Mark Ruffalo — at the Tséhootsooí Primary Learning Center. People drove as far as 19 hours, across state lines and with cars full of kids. Some adults even admitted that while they came for the official gathering, an Indigenous voter mobilization event, they wouldn’t turn down a chance to meet a famous actor.