Congressman Justin Amash, who just announced his decision to join the Libertarian Party and seek its 2020 presidential nomination, officially changed his partisan affiliation in the Congressional directory to “Libertarian.”
Amash becomes the first sitting member of Congress to fully affiliate with the Libertarian Party. Former Congressman Ron Paul was a lifetime member of the Libertarian Party during part of his Congressional career but always listed himself as Republican in the Congressional directory.
According to Ballot Access News, Amash is the first Congressman to list himself as a member of a nationally organized party other than the Democrats or Republicans since Vito Marcantonio listed himself as a member of the American Labor Party. He left Congress in 1951.