PORTLAND, Maine (AP) – The Democratic Socialists of America is endorsing Zak Ringelstein in his bid to unseat popular independent Sen. Angus King in Maine.

The public school teacher is the only major-party Senate candidate in the nation to be a dues-paying democratic socialist. And he’s the first Senate candidate to earn a DSA endorsement this year.

Founded nearly four decades ago, the DSA is seeing greater support since the election of Republican President Donald Trump in 2016. DSA-endorsed U.S. House candidate Alexandria Ocasio-Cortez won the Democratic nomination in her race in New York, scoring political upset against an incumbent Democrat.

Ringelstein says he wants to join Ocasio-Cortez and Sen. Bernie Sanders of Vermont is bringing about “revolutionary change.”