In today's political world, it's apparent that racism and antisemitism isn't an even-handed phenomenon between the two major parties. Clearly, prominent Democrats are much more likely to overtly express such views and advocate policies consistent with them than are prominent Republicans. Furthermore, the Democrats are much more accommodating to such individuals in their midst.
Oh I agree with you completely. I try to be empathetic when I view this issue, trying to view it through others's eyes. I think the primary reason why African Americans vote for Democrats is because they believe that the people who hate blacks are Republicans. It has little to do with facts at this point. Some of it is rooted in the GOP's "southern strategy" from the 1960's, but that was 2 generations ago. Why do they stay? It's not so much because they think Republicans are racists, but because they think the racists - no matter how few - are Republicans. They don't want to join the party or vote for the party because that would be like joining a party that accepts racists.
Now you can take the inverse of that and apply it to Jews. Or not yet, but soon. Most of the virulent anti-semites are on the left. The Israel haters are on the left. The left coddles the Islamists who preach not just anti-Jewish propaganda but literally that they want to kill Jews, and the moderate left doesn't reproach them. At some point the Jews, like the Blacks, will decide they don't want to be in a political party that along with the people who want to kill them and worse covers up anti-semitism, pretends it isn't there, and couches it in logical fallacies like "if only Israel would do this or that then people wouldn't hate the Jews so much" or "it is only natural that if Israel does X,Y and Z that people will come to hate Jews".
How many "Hymietowns" do my Jewish brothers and sisters have to hear before they leave that party of the damned? A lot, apparently, but leave they will. They will have had enough of the Jesse "Hymietown" Jacksons, Cynthia "I lost because of Jews" McKinneys, Al "Diamond Merchant" Sharptons, James "the Jews sent our country to war in Iraq" Morans, Ernest "Bush went to war for the Jews" Hollings... and now you see even in the decidedly leftist protest in New York City antisemitism about Jewish bankers beginning to creep into the marchers' repertoire.
Bill Maher suffers from selective memory, or, he thinks because the Jews put up with all that, they will put up with more. At some point they will leave that party in droves.