Writers for late-night television shows, including The Tonight Show with Jay Leno and The Daily Show with Jon Stewart, have lamented recently that they would love to bust President-elect Barack Obama's chops more. But fear of a politically correct backlash and a lack of major stumbles to date on Obama's part make him a tough topic. Stand-up comedians, though, say Obama is fair game. ''Those TV writers have to worry about ratings. They don't like boos or groans from the audience. We thrive off of it,'' said Lisa Lampanelli, a comic famous for her no-topic-is-off-limits policy, and her obsession with...