New evidence suggests that unions may be more important than Democrats in reducing inequality. … With the enemies at the gate, the liberal elite seems to have finally learned to love unions. … But it may be too little, too late. Democrats did little to defend unions when it counted. …To be fair, some of these pressures came from global trends, but public policy played a key role in tilting the field against labor. Now Republicans are fighting to drive a final spike in the heart of the most effective anti-inequality movement in history. If liberals do nothing to shore up unions, their decline will only continue. That will have important implications for inequality….