A survey of 1959 likely voters in Missouri was conducted by Gravis Marketing on September 16th and 17th.
Obama and Romney
Romney holds a large lead over Obama based on this poll, with 47.7% support compared to Obama's 39.3%. Unsure voters also tend towards supporting Romney in Missouri, with 41.4% swinging support his way.
The key for Romney's lead here appears to be all age categories over 30. Romney's widest lead is in the 40-49 age category.
Automated Poll conducted with likely voters in the State Of Missouri.
Missouri Poll (Sep 17, 2012