 Complete the following phrase:  Roosevelt served as president from 1901 to 1909 as a Republican, and Taft succeeded him with his support. However, Tafts 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 