Rep. Michael Capuano has been a progressive presence in Congress for nearly 20 years. Known as much for his staunch — and vocal — advocacy in Washington, D.C., as his record of securing funding for projects back home, Capuano has enjoyed high popularity in the deeply liberal 7th District.

He’s now facing the challenge of his congressional career from Boston City Councilor Ayanna Pressley, who’s aspiring to become Massachusetts’s first black person elected to the U.S. House of Representatives in Tuesday’s Democratic state primary election.