I find it interesting you failed to post the parts of the anouncment that say:
Damien LaVera, a spokesman for the National Nuclear Security Administration, said the document had been reviewed by a number of U.S. agencies and that disclosure of the information did not jeopardize national security. He said the document is part of an agreement on nuclear material inspection under the IAEA's nuclear nonproliferation effort.
"While we would have preferred it not be released, the Departments of Energy, Defense, and Commerce and the NRC all thoroughly reviewed it to ensure that no information of direct national security significance would be compromised," LaVera said in a statement.
An Energy Department official, who spoke on condition of anonymity because the official was not authorized to discuss the situation publicly, said none of the sites on the list are directly part of the government's nuclear weapons infrastructure."
I also find it interesting that you seem to think Obama is directly responsible; and I must say I have to agree - I think the President should personally read ever single word of every official government document, and personally decide which should or should not be classified. This is called "taking personal responsibility"; just as he should personally be responsible for knowing exactly where both of the Air Force One jets are at all times. Furthermore, he should personally know exactly what ever single person who works for the US government at any position at any level is doing at any given time; after all, he is their boss. I also think that , in cases such as this one where potentially sensitive and dangerous bits of info have been exposed, it is our duty as concerned and patriotic Americans to be sure and post the story on the internet as often as we can , pointing out any specific bits of information we might know such as the location and actual processes being done at these facilities, just in case anyone failed to copy such info before the site was removed.