Stewart was elected as chairman of the Illinois Prohibition Party in 1896 and presided over the
1896 national convention. In 1900, he was elected as chairman of the
Prohibition Party. In 1904, General
Nelson A. Miles was exploring a run for president with the possibility of running as the nominee of the Prohibition Party. Stewart was opposed to Miles' candidacy as he did not want the party to endorse a former military officer and was wary of Miles' desire to be nominated at the
1904 Democratic National Convention. Though Miles dropped out prior to the Prohibition Party's convention, Stewart was floated as a prospective opponent to General Miles as several state delegations attempted to revive the General's candidacy. Ultimately, the party's nomination went to
Silas C. Swallow. In 1905 he was removed from his position as chairman after he was accused by former presidential nominee
John G. Woolley and other prohibitionists of misappropriating over $50,000 and was replaced by Charles R. Jones of
Philadelphia.{{cite news|title=Jones Elected Chairman|page=10|newspaper=
Birmingham Age-Herald|publisher=
Library of Congress|date=January 8, 1905|access-date=August 26, 2022 ==Illinois House of Representatives==