In prison, Debs read various works of socialist theory and emerged six months later as a committed adherent of the international socialist movement. Debs was a founding member of the Social Democracy of America (1897), the Social Democratic Party of America (1898) and the Socialist Party of America (1901). Debs ran as a Socialist candidate for President of the United States five times, including 1900 (earning 0.6% of the popular vote), 1904 (3.0%), 1908 (2.8%), 1912 (6.0%) and 1920 (3.4%), the last time from a prison cell. He was also a candidate for United States Congress from his native state Indiana in 1916.