The rest of the piece compares Obama to Shabbtai Tzvi, Lenin, and the Golden Calf (really). As for J Street, they come under fire for not being huge fans of the Christian Zionist movement, who we all know just have the Jews' best interests at heart (see also Mr. Kirchick). One doesn't have to believe that John Hagee is really thinking eschatologically when supporting Israel to think that his brand of support is an awful, awful idea. If you think (as I do) that the settlements are both a) an impingement on Palestinian rights and b) an existential threat to Israel's existence as a Jewish, democratic state, then someone encouraging them to continue
I have to say, I'm heartened by the generally poor quality of the anti-J Street opposition. With enemies like this, who needs friends?