This survey of 500 likely voters was conducted Tuesday night, when Obama clinched the necessary delegates to secure the Democratic nomination. Rasmussen notes, "That’s a big improvement for the Democrat who trailed McCain by six percentage points a month ago and fifteen points in March."
13% of Missouri Democrats say they'll vote for McCain. Only 8% of Republicans will go with Obama. 26% of unaffiliated voters are not supporting either candidate at this time.