Ari Berman wants fewer Blue Dogs in the Democratic coalition:

[...] Democrats would be in better shape, and would accomplish more, with a smaller and more ideologically cohesive caucus. It’s a sentiment that even Mr. Dean now echoes. “Having a big, open-tent Democratic Party is great, but not at the cost of getting nothing done,” he said. Since the passage of health care reform, few major bills have passed the Senate. Although the Democrats have a 59-vote majority, party leaders can barely find the votes for something as benign as extending unemployment benefits.