This poll strikes me as the likely outlier of all of these (though I recall saying we should never trust any poll from New Mexico), but it is good to see polls of these states from a good polling organization, especially Utah and Wyoming which we never see!
As I recall there is a tendency for M-D not to push undecideds very much (they tend to have higher number of undecideds than other serious firms). From what we've seen previously could this make McCain's margin in Arizona lower? I'm thinking CarlHayden types.
Possibly. In general, in this election the undecideds tend to be leaning McCain for the moment.