Iraq at 4; Dems say Pullout, W Says Veto; Eliz Edwards Cancer; Subpoena Showdown; Obama Ad

It's the 4th anniversary of the Iraq War, now Iran's nabbed some Brits. House votes support but pullout, W says he'll veto. John Edwards runs in spite of Elizabeth's spreading cancer; Subpoena Showdown with Judiciary Committee; Ad Creator of Obama's Hillary spoof revealed.