Let's set aside the fact that an advertisement supporting Michigan Democratic Senate nominee Abdul El-Sayed appears to reach into one of the ugliest reservoirs of antisemitic insinuation: the suggestion that Jews, or in this case the Jewish state, are somehow responsible for the economic misfortunes of ordinary Americans. Set aside, too, the difference between criticizing American aid to Israel and blaming the Jewish state for the price of eggs in Michigan, an insinuation that echoes centuries-old antisemitic accusations that Jews are responsible for other people's economic suffering. Consider instead El-Sayed's response. His campaign disavowed any affiliation with the advertisement, circulated...