I think Iowahawk said it best in Twitter a few minutes ago:
After years of useful service to Obama, birthers get thrown under the bus.*snerk*
The hardest of the hardcore, the ones who have based their life around this for the last three years, are not going to change their mind, but they wouldn't if you could take them in a time machine to the delivery room and let them witness the Blessed Event. They'd claim it was a hoax.
When you've built your life around a belief, it can be hard to admit you were wrong; I mean, what's somebody do whose whole identity these last three years has been running BirtherForums.com? I mean, when their claim to fame is being the moderator at the forum there, and all their friends are people that they meet at the monthly BirtherForums get-togethers, are they just going to say "Whoops. Guess we were wrong."?
No, they're going to call me an easily-duped sheeple in 5... 4... 3...
(PS: The timing is what's bugging me. This was a big hole card that Barry had been sitting on for a while. Why now?)