Keith Olbermann just needed to find his voice. He'd been a droll sportscaster, a serious news anchor and a bickering critic of Fox News host Bill O'Reilly. But none of those personas really clicked. Then he found one. A little over a year ago, as the White House fumbled and botched the Hurricane Katrina recovery, Olbermann finally blew up. He concluded a broadcast of his MSNBC cable news show, "Countdown,'' with an indignant rant in the rat-a-tat-tat cadence of his idol, Edward R. Murrow. He called it a "Special Comment.'' And just like that, Olbermann found his voice -- the...