'Voting Irregularities'

"Despite clear rules and timelines laid out by the Nevada Democratic Party that caucus doors should remain open and voter registration should continue until noon, the Clinton campaign encouraged their operatives to close the caucus doors at 11:30 am, a half hour before that deadline."

Uh-oh. I don't think it made much of a difference. I don't think Obama thinks it made much of a difference either, but it's a good excuse for the loss.