Same link as above
So the New Party claimed Obama as a member as of 1996. Progressive Populist magazine agreed in this editorial:
New Party members and supported candidates won 16 of 23 races, including an at-large race for the Little Rock, Ark., City Council, a seat on the county board for Little Rock and the school board for Prince George's County, Md. Chicago is sending the first New Party member to Congress, as Danny Davis, who ran as a Democrat, won an overwhelming 85% victory. New Party member Barack Obama was uncontested for a State Senate seat from Chicago.
The Democratic Socialist Party of America was slightly more modest in claiming Senator Obama as an adherent:
