Brown has the infrastructure in place to run in the special election, but I think he was badly damaged towards the end of his race with Warren, and exposed as a real lightweight. He dances around the issues to pose as a "centrist," but that was a tactic many get burned by in the end, because your opponent always frames you as a candidate who believes in nothing (see one Mitt Romney). I think the fact that Brown is already hitting Ed Markey shows how afraid he is that the DNC will be able to mobilize the Warren voters and hold that seat with a safe Democrat until Deval Patrick can slide into it in a few years. I'll be interested to see how the President involves himself, though- he waited too late to try to save Martha Coakley in 2009- I doubt he'll make that mistake this time, especially with the position of strength his party currently holds in just about every area, even in the chamber of Congress they don't technically control. This is their chance to plant the foot on the throat of the GOP going into the midterms. I've been a fan of Chuck Hagel's for quite some time. I think the fact that many of the Reagan and HW Bush Republicans are publicly supporting him will further shed light on how astray the modern GOP has gone, as if anyone needs help seeing that.