Rep. Mike Castle (R-Del.), who was upset by Tea Party-backed Christine O'Donnell in Delaware's Republican Senate primary last week said Wednesday night he hasn't yet ruled out waging a write-in bid this fall.

Castle told reporters Wednesday he is leaning against the idea, but he said he was considering it because "I've had a number of people who've asked that I do that."

In the wake of his loss to O'Donnell, Castle's campaign ruled out waging a write-in bid, which is Castle's only remaining option if he wants to jump back into the race. He has until Sept. 30 to decide. 

Despite raising close to $2 million online in the wake of her victory over Castle and garnering significant national media attention, polls show O'Donnell trailing New Castle County Executive Chris Coons (D) by a wide margin. 

A CNN/Time poll released Thursday gave Coons a 55 percent to 39 percent lead over O'Donnell among likely voters. But if Castle were the GOP nominee, the same poll showed he would be the one with the advantage over Coons — 55 percent to 37 percent.