A very good analysis.
Too many Republicans think that we have some sort of perfect storm in DC with which to swamp the Democrats. We don't. While we firmly control the White House and the House of Representatives, we do not really control the Senate. To get a lasting lock on the Supreme Court, and really begin to undo the last 70 years of Democrat rule, we need to control the Senate. That isn't going to happen as long as we're stuck with the likes of Specter, Lott, and McCain. So in the here and now that we actually have, Bush has to make appointments that will pass that weakly held Senate.
The perfect cannot be allowed to become the enemy of the good. While there are perfect candidates for the Court, a good one that actually passes confirmation is a better choice.