Ralph Nader and Al Gore refuse to fade gently into the night. Sharing headlines with Jennifer Aniston, they are coming to Sundance. The former presidential foes are trying on new hats: movie stars. Nader is the subject of Henriette Mantel and Stephen Skrovan's An Unreasonable Man, which painstakingly documents (we're talking a 155 minute run time) the liberal Green party crusader's early days. Davis Guggenheim's far shorter activist doc An Inconvenient Truth chronicles Al Gore life-long mission to reverse global warming. Hope they won't spoil each other's chances — again.