Democrats who promoted progressive policies included George Earle Chamberlain (governor 1903–1909 and senator 1909–1921); Oswald West (governor 1911–1915); and Harry Lane (senator 1913–1917). The most important Republican was Jonathan Bourne Jr. (senator 1907–1913 and national leader of progressive causes 1911–1912).Carlos A. Schwantes, The Pacific Northwest: an interpretive history (1996) p. 347.
