De Blasio, Warren Escalate Pressure on Clinton

Like Elizabeth Warren, New York Mayor Bill de Blasio isn’t running for president — he’s running to influence the presidential race. So when he and Warren appear together at the National Press Club in Washington before unveiling his Contract with America for the left, it will be the latest step in the Democrats’ primary within the primary: liberals’ effort to figure out how to push Hillary Clinton to the left. The primary within the primary may prove more challenging for Clinton than the real thing, in which she’s leading competitors by up to 50 points in some polls.