DEMS RESPOND TO LIEBERMAN…. What does the end of Joe Lieberman’s career in Democratic politics look like? A little something like this.

A senior Barack Obama campaign adviser said Lieberman flat-out lied when he told delegates that Obama never successfully reached across party lines.

“Joe Lieberman ought to be ashamed of himself for some of the things he said tonight, not as a Democrat but as an American,” adviser Robert Gibbs said on “Larry King Live.” […]

“In the Senate, [Obama] has not reached across party lines to get anything significant done, nor has he been willing to take on powerful interest groups in the Democratic Party,” Lieberman said in his speech.

Gibbs stressed that it was a “flat-out lie” that Obama hasn’t reached across party lines during his time in public office. Gibbs cited Obama’s work with Sen. Richard Lugar, R-Indiana, to keep nuclear weapons out of the hands of terrorists and with Sen. Tom Coburn, R-Oklahoma, on the government budget.

Gibbs blamed what he called lies like those perpetrated in Lieberman’s speech for disillusioning voters and making them cynical of the government. “I think [Lieberman] owes it to the American people to look into the camera and tell them the truth,” Gibbs said.

Bill Richardson told CNN Lieberman’s betrayal is “a little bit sad.”

Anita Dunn, a senior Obama advisor, told MSNBC, “Let’s dispose of Senator Lieberman first, because the fact of the matter is what he said is not true and he knows it is not true, so it’s kind of the continued moral degeneration of Joe Lieberman on display for the entire country to watch.”

For months, the official line from Dems when it came to Lieberman was tepid disappointment, coupled with mild rebukes. The disdain has since become palpable.

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Steve Benen

Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.