I Missed Jonathan Tobin's Post on John Mearsheimer...

See Tobin's brief essay at Commentary, "Mearsheimer’s Vanishing Veneer of Respectability." This part is excellent:
The author of the book Mearsheimer admires is Gilad Atzmon, an ex-Israeli who not only doubts the truth of the Holocaust but also thinks the Jews persecuted Hitler and Nazi persecution of the Jews was justified. For Atzmon, any expression of Jewish identity is tantamount to racism. He believes Israel is worse than Nazi Germany. His hatred of his own people has even motivated him to claim medieval blood libels might have been true, and the Protocols of the Elders of Zion provides historical insights about the Jews.
And:
The Israel Lobby was itself a typical example of anti-Semitic invective in the way it sought to delegitimize Israel’s American supporters and to single them out as sinister forces undermining democracy. But because its authors were two distinguished academics, they were able to cloak their prejudice in more respectable garb. One can only hope Mearsheimer’s endorsement of Atzmon helps to strip away that unjustified veneer of respectability that continues to attach to the authors’ work.
That ties in pretty well with my remarks at "The Tragedy of John Mearsheimer." Both Mearsheimer and Walt are scholars I admired. But in the end my ignorance is inexcusable. I long viewed The Israel Lobby through the lens of pluralist political science, perhaps out of deference for these "two distinguished academics." But it's not looking good for Mearsheimer. Even hardline anti-Zionists are throwing him under the bus. It's devastating, as noted previously.

See also the update from David Bernstein, "John Mearsheimer and Gilad Atzmon Update." And earlier at Israel Matzav, "John Mearsheimer comes out of the closet." (Apparently not all the BDS types have bailed on Atzmon.)