Roosevelt served as president from 1901 to 1909 as a Republican, and Taft succeeded him with his support. However, Taft's actions as President displeased Roosevelt, and Roosevelt challenged Taft for the party nomination at the 1912 Republican National Convention. When Taft and his conservative allies narrowly prevailed, Roosevelt rallied his progressive supporters and launched a third-party bid. At the Democratic Convention, Wilson won the presidential nomination on the 46th ballot, defeating Speaker of the House Champ Clark and several other candidates with the support of William Jennings Bryan and other progressive Democrats. The Socialist Party renominated its perennial standard-bearer, Eugene V. Debs.