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People, think.
The choice begins, and essentially ends, with Electoral Votes.
While you are spot-on about the EV situation, we ARE in fact thinking - but about something different. McCain is very liberal and many conservatives will not vote for him. A conservative, or even a possible one, on the ticket, could change some minds (mine included). Any conservatives in those states you mentioned?
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There are certainly possible candidates from those states who are more conservative than Obama, which is all that matters. The EV situation in Colorado, Ohio, Wisconsin, Michigan and New Mexico does constrain the choice to people who can bring those EVs to the table.
Of the choices discussed, only Romney can make a claim to help in one of those states, which are the only ones that will matter this year. Michigan EVs can be brought into play by Romney.