It was the hottest ticket in town, a black-tie dinner gathering of Washington's political and media elite but Dick Cheney couldn't make it. The former vice president was busy, President Barack Obama joked, working on his memoir "tentatively titled, How to Shoot Friends and Interrogate People.' " As the star attraction of Saturday night's star-studded annual White House Correspondents' Association dinner, Obama enjoyed poking fun at his critics and the Republican Party. But his own administration, in power for just over 100 days, was also a target of the president's playful digs and one-liners. "I believe my next hundred...
