HE’S IN

Nader announces 2008 presidential run to fill the void. Watch clip above. Read transcript here.   Singer-payer supporters who want George W. Bush impeached get their man.   On "Meet the Press," long-time consumer advocate dishes usual rhetoric on issues and denies/decries the "spoiler" label.   Clinton's response to the news: "Did he really? Well, that’s really unfortunate."   Obama says at Ohio presser: "He does it every four years."