Why the hell does Peter Beinart have any credibility? Because he was annointed by TNR and the DLC as spokeshole for the Democratic Warmongers?

I'm also curious how you define an "idea broker." You listed  Karl Rove, Grover Norquist, Jack Abramoff, and Scooter Libby. It seems to me that a broker is a link that provides two way communication, which Rove and Norquist obviously do. People like Libby may provide two way communication between think tanks and the GOP, but I don't see how Abramoff acts as a broker of any ideas or communication.

I also don't see how Beinart, Paul Begala, James Carville, Peter Beinart, Dan Gerstein, and Katrina vanden Heuvel qualify. Their common characteristic is top down communication. Do any of them have links with any grassroots organizations that they could at least pretend to represent?

A huge part of the problem is the "Democratic Party Speaks. Idiots In Grass/netroots Listen!" attitude among the Democratic leadership. The blogosphere gives them feedback every day of the week. The problem is that they don't listen or respond.