Senator Lieberman came to New York City Tuesday night to woo Democratic voters and was interrupted by jeers from the audience, according to a dispatch by Nedra Pickler of the Associated Press. It’s another sign of the sorry state of today’s Democratic Party. Mr. Lieberman was speaking of his support for President Bush in the liberation of Iraq. It’s nothing for Mr. Lieberman to be ashamed of — American troops freed Iraq remarkably fast and with remarkably few casualties, leaving the world a safer place. Yet among Democrats in Manhattan — particularly some young ones who were part of the group Mr. Lieberman was addressing, Democratic Leadership for the 21 st Century — support for the war is apparently cause for derision. Mr. Lieberman “was interrupted by hissing,” the AP reported. With support for Mr. Bush’s foreign policy leadership running at 70% or better in recent polls, a Democratic Party primary electorate that behaves this way is showing itself to be far out of tune with the majority of Americans.” That’s not the first time I’ve been booed or heckled,” Mr. Lieberman reportedly said Tuesday night. The DL21C group expects to host all of the Democratic candidates. No doubt there are some members of the young Democrats group that supported the war. Yet if these are the gatekeepers to the Democratic Party nomination, the party is going to have a difficult time winning the general election. Much was made of the extremism on display by Patrick Buchanan at the Republican National Convention in 1992. A decade later, it was possible to oppose the war in Iraq without being extremist. But if the heckling of Mr. Lieberman by the antiwar extremists continues through this primary season and the convention, it will be a spectacle that makes the Democrats look like a fringe phenomenon to the majority of Americans.