VICTORYCAUCUS.COM has got Professor Bainbridge unhappy, but I certainly agree with this suggestion:
The national disgrace of gerrymandering has created a system in which the vast majority of House seats are safe for one of the two parties. As a result, the real action is in the primaries, which tend to be dominated by activists. As a result, we see the polarization of Congress, as GOP candidates tend hard right to win their primaries and vice-versa for the Democrats. Now the netroots plan to exacerbate the problem.
The solution seems obvious. A national system of nonpartisan redistricting designed to maximize the number of truly competitive seats. In such a system, candidates would succeed by appealing to the center rather than the extremes, which in turn would reduce the destructive influence of the rabid partisans on both sides of the net.
This is another of those things that I would be more excited about if the prospect of it working were better.