Several recent reports have acknowledged Bloomberg’s policy differences with Obama, but sources close to both men tell me the antagonism runs much deeper. In private, Obama thinks Bloomberg acted high-handed and arrogant, while Bloomberg has told friends that Obama is a lightweight, sources said. “Mike would have dinner parties and piss all over Obama when he was president. I know because I attended them,” a prominent Democratic donor told me…

A confidant of both Bloomberg and Obama told me the tension between them was in part fueled by Bloomberg’s belief that he should be president. “Bloomberg would belittle Obama in private. It was like, That should have been me in the White House. There was jealousy there,” the source said.