As these columns went to press last night, it was still too early to call a victor in Connecticut's Senate primary. One thing is sure despite the outcome, however: Senator Lieberman confronted more than just a hard-fought campaign. He was up against a jihad. If Mr. Lieberman is celebrating a victory this morning, it's a sign that there is still room for moderation in the Democratic Party. But any celebration will be clouded by the vitriol, resembling a perverse kind of religious fervor, he had to overcome. The portent for the party's future will be only more troubling if Senator...