A judge struck down New York’s new congressional and legislative maps on Thursday as an illegal gerrymander, dealing a setback to Democrats who were expected to benefit heavily from the new political lines. In a ruling, State Supreme Court Judge Patrick McAllister in Steuben County ordered state lawmakers to draw new lines within the next 12 days. If they are unable to submit new maps by April 11, “the court will retain a neutral expert at State expense to prepare said maps.”