McKay scored again at the 12:21 mark of the second period.
The Canucks, who trailed by three games to one in the series, ran up a 5-1 lead before the 12-minute mark of the second period.
Nighbor tied it at the ten-minute mark of the third period.
Darragh scored at the 14-minute mark of the first period.
By the 17-minute mark of the first period, the Senators had amassed a 4-0 lead through several errors.
At the 9:50 mark of the period, the Devils drew even.
Berg's goal, at the 47-second mark of the second period, gave the Rangers a 3-1 lead.
Until the 12:52 mark of the second period, the game had been a defensive battle played at a sleepy pace.
The Rangers did find something to work with just past the 11-minute mark of the third period.
Lidstrom's second goal came from outside the blue line, also between Roy's feet, at the 32-second mark of the third period.