Clarkson's tallies -- his eighth and ninth of the season -- boosted the Eastern Conference-leading Devils to a home-and-home weekend sweep of the Penguins.
Tomas Vokoun was touched for three goals on 23 shots as Pittsburgh was humbled by the Devils for a second time following a five-game winning streak.
James Neal provided Pittsburgh's only goal.
Wisconsin business offering 'therapeutic cuddling' forced to close
Police: Sword-wielding man demanded free tacos