Are you talking about Romney/Ryan? Real Clear Politics has been showing Missouri as red for a long time -- it's not a swing state, and they don't have to spend time there. If Obama or Biden isn't there, then it means they are not contesting it.
I guess you haven't heard about Todd Akin. He is a true conservative Republican running against an ultra Obama liberal Democrat for U.S. Senate. Romney, Rove and the GOPe dumped on his for making a Pro-Live statement that turned into a 15 second gaffe. RNC held back all funding as well as support. I guess the GOPe don't need Missouri to get them a majority in the Senate. Amazing.