In any election season, campaigns and candidates will ask how to appeal to a certain demographic to ensure that they will receive their votes.
I understand that Bernie wants to appeal to progressive voters. However, the choice of Ms. Sarsour, I fear may backfire. Especially with his fellow Jews who are feeling anxious (myself included) about the rising antisemitism in the world.
I also understand that he wants to appeal to the Arab-American community.
However, in trying to appeal to the Arab-American community, he is forgetting his coreligionists. There are quite a few candidates to chose from. In over-appealing to one community, he may forget another, which may end up costing him the nomination next fall.