So you are sure that their "relationship soured under the political spotlight." What's the source for that quote? Somewhere in the MSM, I'd guess?
[For some time, Lerner had a warm relationship with Hillary Clinton - and, by extension, with Bill Clinton also. Lerner's 1997 book titled The Politics of Meaning was the source of Mrs. Clinton's widely publicized use of that phrase. In a spirit reminiscent of the inscription atop Lerner's wedding cake, one of his book's chapters is entitled "The Tyranny of Couples." In Hell To Pay, her biography of Hillary Clinton, author Barbara Olson reports that Lerner, during his years of friendship with Mrs. Clinton, liked to frequently invoke the phrase, "Hillary and I believe" as a prelude to identifying points of agreement he shared with her.
However, as the Clinton presidency progressed, Lerner, a devoted far-leftist, lost interest in Bill and Hillary when he saw that polling data and focus groups were leading the administration toward moderation on such issues as welfare reform and social welfare spending. ]
Simple; but believeable inasmuch as neither Bill nor Hillary hold to core values (such as they are) over polling data that requires of them; a change of direction. . .