I just made a lengthy comment to David's last post, which on reflection should have been a post of my own. So go look. Short version: I remain unconvinced that's there's not much difference between Dems and GOP in the aggregate (obviously in any particular race, one might be clearly better than the other).

While I'm here, some shameless self-promotion: any L&P readers at the Univ of Wisc, feel free to come to a talk I'm giving next Wednesday.