Gov. Bill Ritter's decision to step aside after one term is somewhat unique in Colorado history. Most chief executives have, at least in recent decades, been re-elected.
The last Colorado governor who did not serve a second term was John D. Vanderhoof. He served between July 1973 and January 1975 after succeeding John Love in office when Love took a job in President Richard M. Nixon's administration. Vanderhoof sought re-election in 1974 but was defeated by Democrat Richard D. Lamm.
Prior to Vanderhoof, who was a Republican, the last governor who did not serve a second term was Democrat Edwin Johnson. He served between 1953-55, during the era when the length of a governor's term was just two years.
Other one-termers since statehood include Democrat James Grant (1883-85), Republican Benjamin Eaton (1885-87), Democrat Alva Adams (1887-89), Republican Job Cooper (1889-91), Republican John Routt (1891-93), Populist party member David Waite (1893-95), Republican Albert McIntire (1895-97), Democrat Alva Adams (1897-99), Democrat Charles Thomas (1899-1901), Democrat James Orman (1901-1903), Republican James Peabody (1903-05), Republican Henry Buchtel (1907-09), Democrat Elias Ammons (1913-15), Republican George Carlson (1915-17), Democrat Julius Gunter (1917-19), Democrat William Sweet (1923-25), Republican Clarence Morley (1925-27), and Democrat Teller Ammons (1937-39).