Left behind: Progressive groups struggle for relevance in Biden era

The image, used in ad after ad, stuck with Rhode Island Democrats: White House staffer Gabe Amo with Joe Biden, in the Oval Office. As early voting wrapped up, Democrats in the 1st Congressional District saw another potent image: Amo and Patrick Kennedy, their old congressman, who warned that Bernie Sanders-endorsed front-runner Aaron Regenburg would put the state’s defense economy at risk.

“We need someone who understands the way Washington works,” said Kennedy.

On Tuesday, Amo won his first-ever race by 3000 votes, ending this year’s Democratic primary season — and dealing the latest…