With 86 percent of precincts reporting, Tsongas has tallied 51 percent of the vote to Ogonowski’s 46 percent.
The Democratic Congressional Campaign Committee issued a statement immediately after the AP called the race.
“Congratulations to Niki Tsongas on her victory tonight. She is a lifelong advocate for children and working families in Massachusetts. Niki will be a tremendous asset to the Democratic Caucus,” said DCCC chairman Chris Van Hollen.
“Massachusetts voters sent a clear message, they support candidates who fight for their values to provide children’s health care and work to end the war in Iraq.”