As for Missouri, I think Clinton would have been a stronger candidate there and considering Obama barely lost it, I think she would've had a >50% chance of taking it. The real question for Missouri is whether low black turn-out in the cities would counter Clinton doing better among rural whites (and thus keeping the state for McCain). I have a feeling she would win it by 1 or 2 points, though.
I agree. My guess is that Clinton would have employed a 2006 McCaskill-like strategy of campaigning out in the exurban and rural areas to cut into McCain's base. It would not have been difficult for her to down a shot and then bang the drum against the McCain-Bush economic policies in front of these folks. In this climate I think Clinton's turnout in the cities would have been fine.