Well I guess it could be possible but a DH would have to put up monster stats probably to beat out another position player, unless their was only one other positional player with horrible defense or something. I'm not really too set on it anyways, since I really don't give a fuck who wins the MVP. Its just a bunch of personal opinions with the majority winning, doesn't really mean much to me.
Hafner and Ortiz has pretty similar stats, Ortiz with more total bases/HRs while Hafners OBP is a higher and his AVG is a bit higher as well.

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