Philip Klein turns to the Bard to find the silver lining in McCain's cloud:
By so much shall I falsify men's hopes;
And like bright metal on a sullen ground,
My reformation, glittering o'er my fault,
Shall show more goodly and attract more eyes
Than that which hath no foil to set it off.
Read the whole thing. He properly identifies the 'bright side' of McCain's predicament. But of course, it probably still won't be enough.