Ten-term male Democrat falls to progressive black woman in Massachusetts primary
Rep. Michael Capuano (D-MA via Wikimedia Commons) and Boston City Councilwoman Ayanna Pressley (right via screengrab).

A 10-term incumbent congressman in Massachusetts conceded to a progressive candidate during the state's Democratic primaries Tuesday night.

The Washington Post reported that Rep. Michael Capuano (D-MA) conceded to Boston City Councilwoman Ayanna Pressley after polls closed in the state.

Politico's Lauren Dezenski noted on Twitter that the congressman conceded when only a small percentage of precincts were reporting their results to the Associated Press.