Serious question. There will be some variation of this in the Wednesday morning spin if Romney loses.
You can hear it right here, right now: Michigan is not Mitt's home state, and it hasn't been for some time. Dude can't seriously have four home states, even if he is rich enough to own property in each and every one of them.
His real home state has to be considered to be Massachusetts, since that's where the entirety of his political career was. Even though he's moved to New Hampshire. Even though he ran the Olympics in Salt Lake. Even though his dad was governor of Michigan.