Again, both NBC and CBS polled adults, not registered voters or likely voters but what really jumped out at me was this answer in the detail of the CBS/NY Times poll.   

Did you vote for Barack Obama, John McCain or someone else?   Obama 48%. McCain 25%  Someone else 1%  Voted, Won't say whom 5%  Didn't vote 19%  Don't Know/Wouldn't Respond 1%  

For whom did you vote-Barack Obama, John McCain or someone else?   Obama 41%, McCain 32%, Someone else 4%, Not sure 5%, Did not vote/not sure 18%.