If you go to J Street site you will see that they do not have a place for comments or talkback or contact and their site displays the symbols of Meretz party and Shalom Achshav Party, both parties that are defunct or nearly defunct. These people are not Jews, they call themselves "with Jewish Roots". They want to have their cake and save it. And calling this lobby liberal, is equating true liberalism with the radical left who are espoused to radical islam.
U.S. Catholics largely open to non-traditional families, Pew survey finds (DPA)
from the article: U.S. official's criticism of Israel ambassador sparks furor