Ayanna Pressley SHOCKS Political World — Defeats 10-Term Democrat Congressman In Primary

Capuano conceded defeat to Pressley in the race to represent Massachusetts' 7th District approximately 30 minutes before The Associated Press formally called the race. With 69 percent of precincts reporting late Tuesday, Pressley had the lead by 10,682 votes.Show more

Pressley, who is running unopposed in November, is set to become the first African-American woman elected to Congress from the Commonwealth.

Capuano is the fourth House member to lose a primary this year, along with Reps. Robert Pittenger, R-N.C.; Mark Sanford, R-S.C., and fellow 10-term Rep. Joe Crowley, D-N.Y.

The prospect of a Pressley upset had drawn some comparisons to Alexandria Ocasio-Cortez's defeat of Crowley in June. The New York democratic socialist had endorsed Pressley, as did Our Revolution, the offshoot of Vermont Sen. Bernie Sanders' 2016 presidential campaign.

However, unlike Crowley, Capuano had fiercely contested the Massachusetts race by racking up endorsements, attending debates and highlighting his consistently liberal voting record in one of the most Democratic districts in a traditionally Democratic state.