This week, the world marked the 75th anniversary of the liberation of Auschwitz by Allied forces during World War II. Politicians of all stripes dutifully tweeted, "#NeverAgain." Meanwhile, many of those same politicians continued to forward the worst sort of anti-Semitism, blithely ignoring the fact that anti-Semitism isn't a relic of the past but a thriving part of the present. Take, for example, Rep. Ilhan Omar, D-Minn. Omar has, in the past two years alone, sponsored an anti-Semitic resolution that likened boycotts of Israel to boycotts of Nazi Germany; rejected a Democratic-sponsored resolution backing a two-state solution in order to...