Kos really has to get over his beef with The New Republic. Seriously: There's no solid foundation to it (Kos is certainly more liberal, but he loves to trumpet how he's interested in building a party, not about purging ideological foes), he's wildly over-estimated their hostility to him (cf. Beinart's positive review of "Crashing the Gates"), and there is no real question that TNR has (and I'd say always has) taken just as hard a line on the follies and failings of the Bush administration as any major Democratic media group.
Seriously. Quit it. You're only hurting your cause.