Obama provides a little description of his telephone conversation with Bill Clinton:
"We did not belabor the primary season. I think what we both acknowledged is, is that when you’re in a tough primary battle you say things that afterward you may end up thinking, that may have been a little intemperate. But that’s the nature of political campaigns.”
Also:
“I absolutely want Bill Clinton campaigning for me. He is one of the most gifted public officials of our generation and has been one of the most successful presidents that we’ve had in my lifetime."
Bill Clinton was a mixed blessing for Hillary precisely because he was her husband. That added a layer of intensity to the coverage, and increased her responsibility for what he said. As an Obama surrogate, he'll have more distance, and be more of an asset.