The six challengers: Darcy Burner (Wash.), Chellie Pingree (Maine), Donna Edwards (Md.), Jared Polis (Colo.), Tom Perriello (Va.) and Sam Bennett (Penn.). The plan also has the support of four others who won't be at the conference today: Eric Massa (N.Y.), Larry Byrnes (Fl.), George Fearing (Wash.) and Steve Harrison (N.Y.).
The plan is backed by retired Gen. Paul Eaton as well as a number of prominent liberal bloggers. Matt Stoller of openleft.com said that a site backing the proposal will launch tonight.
Here’s a video in which Eaton describes the contours of the plan.