(Damon Winter | The New York Times) J.D. Vance, part of the crowded field for the Republican nomination for U.S. Senate in Ohio, at the Conservative Political Action Conference gathering in Orlando, Fla., Feb. 26, 2022. Vance and other notable figures in the Republican Party have turned to hate-based politics that follow the old playbook of czarist-era instigators of pogroms, writes the New York Times columnist Paul Krugman.