What Happened To The Filibuster?

Greenwald asks an obvious question:

At least 44 Senators claimed to oppose Mukasey's confirmation -- more than enough to prevent it via filibuster. So why didn't they filibuster, the way Senate Republicans have on virtually every measure this year which they wanted to defeat?

And he offers the obvious answer:

The so-called "60-vote requirement" applies only when it is time to do something to limit the Bush administration. It is merely the excuse Senate Democrats use to explain away their chronic failure/unwillingness to limit the President, and it is what the media uses to depict the GOP filibuster as something normal and benign. There obviously is no "60-vote requirement" when it comes to having the Senate comply with the President's demands, as the 53-vote confirmation of Michael Mukasey amply demonstrates. But as Mukasey is sworn in as the highest law enforcement officer in America, the Democrats want you to know that they most certainly did stand firm and "registered their displeasure."

My primary feeling with respect to the Democratic party remains contempt.