The netroots got very involved in two primaries so far this year. Mark Pera was challenging “Bush dog” Dan Lipinski in Illinois’ 3rd Congressional district. He ran a spirited campaign but lost by double-digits in the February 5 primary.

Donna Edwards came within a few percentage points of beating Al Wynn, one of the worst corporate Democrats in Congress, in Maryland’s 4th district primary two years ago.

This year she was backed not just by bloggers, but also by the SEIU, EMILY’s list, and Democracy for America. She even got the Washington Post’s endorsement.

The final returns aren’t in yet, but the media have already called the MD-04 primary for Edwards. It just goes to show that sometimes, a challenger can beat an entrenched incumbent.

Will the netroots and Democracy for America get behind Ed Fallon now? I hope so, although I must add that Leonard Boswell (disappointing as he can be) is nowhere near as disloyal to progressive causes as Wynn.