I see what you mean, but I don't think "I was made a fool of despite having a wealth of information and access, not to mention a dedicated staff of Washington heavy-hitters and plenty of my own people in the Pentagon" is much of a sympathy play. He has no excuse. I think the presidency ship has sailed, but given how divided and desperate the GOP it could easily split into two separate parties*, with a leadership spot in the non-crazy one for Powell. Problem with that is the neocon wing of the Rethugs despises the tea partying Palin wing as much as it does the old-school Eisenhower wing of Powell & Co.
*As opposed to the Dems, who for years have maintained a party that resembles nothing so much as a high-functioning multiple personality disorder sufferer.