Research 2000 polls in Illinois and Missouri for the St. Louis Dispatch, taken October 20-23 among 800 likely voters:

Missouri
Obama 48 (+2 vs. last poll in September 22-24)
McCain 47 (nc)

Obama leads by 1.0% in the RCP Average for Missouri.

Illinois
Obama 59 (+3 vs. last poll September 15-18)
McCain 35 (-1)

Obama leads by 23.4% in the RCP Average for Illinois.