I know part of this whole thing is about sending an intraparty message that guys like Castle aren’t acceptable, but have we somehow not sent that message already by knocking off Bill Bennett, Lisa Murkowski, Charlie Crist, Arlen Specter, Trey Grayson, Sue Lowden, and Jane Norton?

At the end of the day, yes: Mike Castle would be a weak, unreliable Senator who will do little for the conservative movement, and perhaps marginally weaken the movement within the GOP. But a Castle victory will also deal a blow to the movement’s bitter enemies in the Democratic party, whereas an O’Donnell win is highly likely to increase the power of the Democrats. You want to choose likely defeat with a conservative, do what I’m doing and vote for David Malpass in New York tomorrow. But while there are real and serious arguments on both sides, I can’t let an opportunity to defeat the Democrats and all they stand for pass by, not this year. If I was in Delaware, I’d vote for Castle.