Don't think that even most of the current Jewish donors to the 'Rats would be considered pro-Israel, and certainly the vast majority have absolutely no love for Netanyahu. No, the current crop of Jewish donors to the 'Rats are more interested in supporting "Osama" Obama's perverse agenda than Israel's very survival. Those 'Rat Jewish donors who really care about Israel would have no choice but to have gotten off the Obama bandwagon by now.
Therefore, those Jewish 'Rat donors who still remain would (with perhaps a handful of exceptions) have no qualms about 'Rat Congresscritters not attending the Netanyahu address to Congress. Furthermore, few would even notice those absences because no roll call will be taken and you can bet that the MSM won't be inclined to name the absentees.
Terminally-Ill-Liberal Jews (TILJ)who supported and STILL support Obama and his destructive agenda are simply blind and naive about how the world and politics work and unfortunately, care more about their Hollywood gala bashes than the survival of the fighting (for us as well) Jews of Israel. Their is a detachment of sorts between what it means to be a concerned, aware and caring Jew and whatever their lifestyles dictate.
Any Jew with a brain can see that the Rats are moving away from supporting Israel yet, the Jews remain steadfast in their illusions.
I can tell you that their cousins in Israel have no illusions whatsoever, hence Bibi speaks out and warns the world about the multitude of threats facing the West like ISIS, Iran, North Korea and Co.
The goal is to shut Netanyahu up by ousting him. The West and the Rat's prefer the Neville Chamberlain Obama approach and as Churchill warned in the late 1930’s there is indeed, a “Gathering Storm” and Bibi is causing far too much cognitive dissonance for the West, hence, remove the noisy one.