Nate Silver's FiveThirtyEight has the crucial details...
Tuesday night, Republican Sen. Thad Cochran defied the polls and defeated tea party challenger Chris McDaniel in the Mississippi Senate primary runoff by a 51 percent to 49 percent margin. Cochran couldn’t have done it without expanding the pool of voters, and in the last three weeks he did just that.
The NY Times expounds on McDaniel's seething anger at his party...
Mr. McDaniel, speaking in Hattiesburg, was angry, and he did not hesitate to say so. “There is something a bit strange, there is something a bit unusual about a Republican primary that’s decided by liberal Democrats,” he said.
He accused Mr. Cochran of abandoning the conservative movement. “So much for principles,” he said.
McDaniel: Conservatives 'Will Find Our Backbone'
Tea Party-backed candidate Chris McDaniel said the Mississippi Republican Senate runoff was decided by 'Liberal Democrats,' after he lost to incumbent Senator Thad Cochran. McDaniel said conservatives 'will find our backbone again.' (June 25)