Donna Edwards is the only person aside from Ned Lamont challenging an incumbent in a primary who is on the Eschaton Act Blue list. Edwards is challenging Al Wynn, who is a proud member of the Eschaton List of Losers you see on the bottom left, dedicated to those representatives who sold out their constituents by voting for estate tax repeal and for the bankruptcy bill.
Edwards isn't a new person on the scene, and she has plenty of non-blogospheric support. Once again I'll let Howie Klein tell you about her.