Al Gore, leading man?

To borrow a cliché from the Hollywood marketing playbook, the new global warming documentary "An Inconvenient Truth" stars the former vice president as you've never seen him before. Al Gore wheeling his own suitcase through airports, taking off his shoes and emptying his pockets at security. Al Gore firing up crowds with his one-man PowerPoint presentation show on arctic melt rates, devastating heat waves and dangerous changes in ocean currents. Al Gore cracking jokes, reflecting candidly on his own foibles. The failed presidential candidate doesn't immediately come to mind as the kind of charismatic star Hollywood might turn to to dramatize a pet cause. But his quest caught the attention of a group of filmmakers — among them "Pulp Fiction" producer Lawrence Bender — who have translated it to the screen in a documentary slated to premiere Tuesday at the Sundance Film Festival in Park City, Utah.