I am relying on DeLay's own statement that his candidacy was putting the TX22 seat at risk. I don't think DeLay lied about this, but I respect your contention that he did.
"I am relying on DeLay's own statement that his candidacy was putting the TX22 seat at risk."
Put at risk does not equate to could not win.
Delay left the race, which is entirely different from his resignation in the House. The reason Delay left the race was so another Republican would have time to run and raise money.