Is not going over well in the left side of the blogosphere. Kos has decided not to send him any money:

[T]here is a line between “moving to the center” and stabbing your allies in the back out of fear of being criticized. And, of late, he’s been doing a lot of unecessary [sic] stabbing, betraying his claims of being a new kind of politician. Not that I ever bought it, but Obama is now clearly not looking much different than every other Democratic politician who has ever turned his or her back on the base in order to prove centrist bona fides. That’s not an indictment, just an observation.
[…]
Ultimately, he’s currently saying that he doesn’t need people like me to win this thing, and he’s right. He doesn’t. If they’ve got polling or whatnot that says that this is his best path to victory, so much the better. I want him to win big. But when the Obama campaign makes those calculations, they have to realize that they’re going to necessarily lose some intensity of support. It’s not all upside. And for me, that is reflected in a lack of interest in making that contribution.

Obama is just doing what he has to do to get elected, move to the right. He knows that he has to hide who he really is to get elected because the country won’t vote for someone who wants to take away their handguns and won’t protect them against attacks.
So don’t despair Obamanites, Obama still stands with you on these issues he just has to pretend for awhile that he doesn’t. He knows you’ll understand. He knows, like Kos, you never really fell for all that “new kind of politician” crap.