Whether Gordon Brown actually was snubbed by Barack Obama doesn't really matter. Everyone thinks he was. Clearly the release of the Lockerbie bomber is going to take some time to get over. But it's not just that. Obama's people probably take the view that Brown isn't much longer for this political world and is of little significance.
It would never have happened to Tony Blair, though, would it?
I look forward to reading James Macintyre's thoughts on this. Bearing in mind how crap his US sources have been in the past (cf Obama's view of Cameron) they should make for entertaining reading.