Third Parties,Elections, and Roll‐Call Votes: The Populist Party and the Late Nineteenth‐Century U.S. Congress

What effect do electorally successful third parties have on congressional roll‐call votes? There is widespread belief among scholars that third parties influence the policies of the major parties, but there is little systematic evidence of this influence. I exploit the unique historical context surrounding the Populist Party formation in 1892 to examine the effect of the Populist Party's electoral success on congressional roll‐call votes related to Populist issues. The results are consistent with two claims. First, co‐optation of the Populist Party's issues occurred even before the formation of the party. Second, the co‐optation of Populist policies does not appear to be correlated with the electoral success of the Populist candidates.