If Tom DeLay never stepped down, the GOP would have won...

Or at least that's what Tom Delay thinks. He's quoted by RWN on his own blog here: Tom DeLay.com

I think it's (because of) a variety of reasons. On the House side, taking me out so disrupted the leadership during the time that they should have been planning for a campaign and working towards campaigns (that) they were in chaos. If you remember, I stepped down temporarily because of a Republican rule, not a Democrat rule. They didn't know how to deal with that because no one has ever had to do that before.
Then, we had a full leadership race in January and February and it took John Boehner, I don't know how many weeks to get up and get going. By the time that they were ready to go, it was May and that was too late.