NEW YORK — Bill de Blasio may have found his new calling. The former mayor has in recent days told political allies and labor leaders that he’s mulling a run for Congress in light of the state legislature approving a new House district map that could prove politically advantageous for him, according to two people familiar with the matter. De Blasio, who announced a couple of weeks ago that he would not run for governor despite teasing a campaign for months, made his potential congressional aspirations clear in one call Wednesday afternoon to a prominent city union leader, one of the sources sa…
