The bad news: I couldn’t find anything good for the “Quote of the Day.” The good news: Now I don’t need to.

Delaware Republican Rep. Mike Castle has opted against against running as a write-in candidate for Senate, a decision that strengthens Democrats’ chances of holding the seat on Nov. 2.

“While I would have been honored to represent Delaware in the U.S. Senate, I do not believe that seeking office in this manner is in the best interest of all Delawareans,” Castle said in a statement released this evening. “Therefore, it’s time for Jane and me to begin thinking about the next chapter of our lives.”

Castle, notably, did not endorse Christine O’Donnell, the tea party favorite who ousted him in the GOP primary earlier this year, in his statement leaving the race.

I’m straining for some positive spin here but it’s hard to see any. We’ve already run though the numbers of a three-way race. Not only would Castle have improved O’Donnell’s chances of an upset by peeling Dems away from Coons, he would have increased the GOP’s overall chances of taking the seat. Now O’D has to climb that 16-point hill without any help.

I guess the good news for “true conservatives” is that, no matter what happens, at least there’s no way a RINO will win the seat now. Hooray?