The Missouri gubernatorial election, 2008 was an election for the Governor of Missouri, held on November 4, 2008. The current governor, Matt Blunt, who had decided to retire, narrowly won the 2004 election by beating state auditor Claire McCaskill 51%-48%, and would likely have faced a strong challenger in 2008. McCaskill is now a U.S. senator.
On January 22, 2008, Governor Blunt unexpectedly announced that he would not seek re-election  because he had already "achieved virtually everything I set out to accomplish, and more ... Because I feel we have changed what I wanted to change in the first term, there is not the same sense of mission for a second."
A November 2007 poll conducted by SurveyUSA showed Blunt with a 44% approval rating. His approval among Republicans polled was 68%, but his rating among Democrats was only 23%.
On November 10, 2005, Democrat Jay Nixon filed the necessary paperwork with the Missouri Ethics Commission to launch a 2008 campaign for governor.
The gubernatorial and other statewide office primaries were held August 5, 2008.CQ Politics rates the race as 'Leans Democratic'.