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Ethan Miller/Getty Images | Michael Swensen for The Boston Globe | J. Scott Applewhite/AP | Manuel Balce Ceneta/AP

One thing these possible 2020 presidential aspirants have in common? They’ve all got a 2018 Senate election.

Bernie Sanders, Elizabeth Warren, Amy Klobuchar, and others are making the familiar moves of a candidate eyeing the White House. There’s just one thing they need to do first: Win reelection.

Modular houses are seen being built at the Groupe RCM plant in Saint-Benoit-Labre, one hour south of Quebec city, Thursday September 27, 2018. (Francis Vachon for The Boston Globe)

Francis Vachon for The Boston Globe

Modular building growing in popularity in housing-starved Boston area

RCM Group in Quebec makes about 600 apartments and hotel rooms a year, many of which have been sent recently to Allston, Somerville, and Charlestown.