That would be Jennifer Rubin in Commentary:
A devoted reader who wrings no hands over dead non-peace activists who are killed attacking Israeli forces (do we mourn suicide bombers? — the rules are getting murky) and never quarterbacks on Monday morning tells me that the designation should be “useless idiot” and she is right. The next in the dock is Barney Frank, who, as a “Jew”, is ashamed — he confesses — of Israel and says Palestinians are a victimized minority. He’s calling for an independent inquiry, which suggests that the UN might want to put Richard Goldstone on a retainer rather than pay by the libel; it adds up, you know. Plainly, the J Street sewer is overflowing and washing up on the shore. …
So this is who is qualified to decide who is authentically Jewish and who is not? Someone who refers to the aid activists killed by Israeli naval commandos as “suicide bombers” and to the members and supporters of J Street as the contents of a sewer?
Here are the first two paragraphs of the article (in the Boston Herald) in which Barney Frank called for an independent investigation into the attack on the aid flotilla and thereby put his Jewishness on trial:
U.S. Rep. Barney Frank had harsh words yesterday for the Israeli Navy after a bloody raid on a pro-Palestinian flotilla outside of Gaza, describing nine activists killed in the conflict as “innocent” and calling for an independent inquiry into the showdown. Frank, in a wide-ranging interview with the Herald, went on to say that “as a Jew,” Israeli treatment of Arabs around some of the West Bank settlements “makes me ashamed that there would be Jews that would engage in that kind of victimization of a minority.”
The comments rankled some local Jewish leaders, who said activists on the largest vessel of the six-ship-flotilla sparked the deadly confrontation by attacking Israeli Naval commandos as they rappelled onto the ship.
Note the words I have emphasized.