Says Terence Samuel, with an eye on 2008:
defeating Lieberman will transform the war as acampaign issue. It will move from being an “effectiveness andcompetence” issue that the President and Republicans must defend andexplain to serving as a political litmus test for Democrats.
Suppose Lieberman's position had consistently been "I was right to vote for the war, because I had a reasonable expectation that Bush would do it right, but he turned out to be a total moron who can't be trusted to operate a toaster, let alone rebuild a country, and he totally botched everything." Then he'd have Yglesias and Rosenfeld to argue with, and some grumbling war opponents to placate, but I don't think he'd have Ned Lamont to run against. The widespread criticism of Lieberman isn't that he indulges in the incompetence dodge, it's that he spends his time making other Democrats look like unpatriotic extremists when he should be attacking Republicans. Any strident criticism of Bush will make the partisan base happy, just as any interference with Democrats who are steadfastly bashing Republicans will infuriate them. Hit Bush hard on effectiveness and competence, and the base will cheer.