From the Weekly Standard’s Bill Kristol (here):

Its claim to intellectual integrity has collapsed. Paul Krugman—Ivy League professor, New York Times columnist, and Nobel laureate (the holy trinity of the liberal establishment)—has humiliated himself with a startlingly dishonest attack on Paul Ryan’s budget proposal.
Its Leninist discipline has collapsed. Last week, White House press secretary Robert Gibbs complained about the craziness of the “professional left” in the punditocracy. “Those people ought to be drug tested,” Gibbs explained. “They will be satisfied when we have Canadian health care and we’ve eliminated the Pentagon. That’s not reality. .  .  . They wouldn’t be satisfied if Dennis Kucinich was president.”
Its democratic credibility has collapsed. In recent weeks, the left has the arbitrary rulings and sophistic arguments of federal judges who have overturned an immigration statute that mirrors federal law passed by the state legislature in Arizona, and a constitutional amendment, defining marriage as it has been defined for all of American history, enacted by the citizens of California. The left has also heaped praise on New York mayor Michael Bloomberg, as he, having bought his way to a narrow reelection, showered disdain and contempt on the majority of his fellow New Yorkers who object to a mosque next to Ground Zero.