Donald Trump’s efforts to arouse hate and undermine elections make him the worst president in U.S. history, according to a Washington Post columnist. Jennifer Rubin, a self-described ex-conservative, writes that the 45th president and his MAGA mantra pines to return to a golden age back in time. “Wielding nostalgia for a bygone era — one that is invariably mischaracterized — is a favorite weapon for fascist movements (Make America Great Again), harking back to a time before their nation was “polluted” by malign forces,” she writes. But Rubin contends too may are experiencing selective amnesia,…