Derek Stepan also scored in the first period, Taylor Pyatt made it 3-0 in the second, and Callahan scored the power-play goal in the third that all but sealed New Jersey's fate.
Callahan provided the lead 34 seconds in, Derek Stepan added a goal in the first period, and Taylor Pyatt snapped a long drought in the second for the eighth-place Rangers, who are inching closer to a playoff berth.