Filibusted
While I appreciate the argument here that principle is a good reason to stand up to Samuel Alito, I find the arguments here and here much more persuasive.
The whole idea of filibustering Alito would work wonders for the Democrats had he said that he opposes abortion, or favors the killing of kittens with hammers by our President, or that the President should change his title to king and rule the land with an iron fist.
But they didn't. And the filibuster, which is pretty obvious headed to failure, is based on the pretense that Alito will do all those things above and more. And if he doesn't do those things, well, the Democrats will look even more foolish. In fact, it'd be a double failure, because they not only misjudged Alito, but they also launched an unsuccessful and ultimately worthless filibuster.
And don't think that the media won't point it out if Alito votes to uphold Roe, etc. They'll happily point to the confused Democrats who wasted the public's time blah blah blah forever.
Now, I fully believe that Alito will vote to overturn abortion, give Bush insulation from all lawsuits against him, and start the killing of kittens. And if this is true, Democrats can always point out that they tried, and ultimately failed to keep him off the court. The reason will be clear - the public trusted Republicans to protect their interests, and the Republicans have let them down.
And that, to me, seems like a good campaign issue to run on.