Excellent article by Sidney Blumenthal
Senator Joe Lieberman's defeat in the Democratic party primary in Connecticut is unprecedented in US political history for a politician of his stature. Never before has anyone who appeared on the national ticket of any party been rejected in a primary. When you consider that he was running mate to Al Gore in the presidential election of 2000, in which the Democrat won the popular majority by more than half a million votes, Lieberman's ouster looks even more stunning.
The alpha and omega of Lieberman's trouble is not that he voted to authorise the invasion of Iraq. Nearly all of the Democratic senators voted for the Authorisation for the Use of Military Force bill in the belief, as they were told by the administration, that Saddam Hussein possessed dangerous weapons of mass destruction and was developing nuclear ones. Since then Lieberman has strained to support Bush in every twist and turn in his Iraq policy. He even delivered a now notorious floor speech in the Senate chastising his fellow Democrats, who offered criticism of Bush's glaring failures and absence of strategy: "We undermine presidential credibility at our nation's peril."
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http://commentisfree.guardian.co.uk/sidney_blumenthal/2006/08/why_lieberman_is_essential_to.html