Sanders, who is Jewish, has several beefs with the current government in Israel, not least that he is “embarrassed” by it. Israel should not reflect on Jewish Americans, who are only responsible for their own individual actions and speech. The world is unfair that way, though, and for some people the fascist takeover in Israel will raise questions about what sort of person would not only support it but also try to silence anyone who speaks out against it. Sanders clearly feels that it is an albatross about his neck.
Source: Sen. Bernie Sanders, “Embarrassed” by “racist” Israeli Government, Threatens to Withhold Aid