This is what we get when we elect a president who has no executive experience. Obama blew the visit because he’s overwhelmed and no one surrounding him understands diplomacy enough to know that he blew it:

British officials, meanwhile, admit that the White House and US State Department staff were utterly bemused by complaints that the Prime Minister should have been granted full-blown press conference and a formal dinner, as has been customary. They concede that Obama aides seemed unfamiliar with the expectations that surround a major visit by a British prime minister.

[…]
A well-connected Washington figure, who is close to members of Mr Obama’s inner circle, expressed concern that Mr Obama had failed so far to “even fake an interest in foreign policy”.
A British official conceded that the furore surrounding the apparent snub to Mr Brown had come as a shock to the White House. “I think it’s right to say that their focus is elsewhere, on domestic affairs. A number of our US interlocutors said they couldn’t quite understand the British concerns and didn’t get what that was all about.”
The American source said: “Obama is overwhelmed. There is a zero sum tension between his ability to attend to the economic issues and his ability to be a proactive sculptor of the national security agenda.

Newbies! How embarrassing to have a president who can’t get his act together. At least Bush knew how to do the dance.