D.C. United (6-2-4) remained atop the Eastern Conference — two points ahead of New England (5-3-5).
New England was down two players for 32 minutes and played solid defense until Taylor Kemp's cross connected with the unmarked Arrieta in front of goal for the equalizer.
Chris Tierney was given a red card in the 52nd minute after a studs-up tackle of Chris Pontius just outside the penalty area. Six minutes later, Lee Nguyen was sent off after receiving his second yellow card. It was Nguyen's first red card in his four-year MLS career.
Charlie Davies gave New England a 1-0 lead in the first minute of stoppage time before the intermission. Juan Agudelo had his header blocked by goalkeeper Bill Hamid, but Davies pounced on the rebound for an easy tap in.
Both clubs had long undefeated streaks end in their last matches. The Revolution lost midweek to snap a nine-game unbeaten streak, while United lost in stoppage time last week to end an eight-gamer.
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