In Michigan, you have to declare a party preference when you register to vote. Once you've done so, you can still vote in the other party's primary, as long as you don't vote in both parties' primaries. That's why the dems have caucus's in years like 2000, where Gore was pretty much a shoo-in, and it freed dem voters to go mess with the GOP primary results, which is why McCain won the 2000 Michigan primary.
At least that's how it used to be.
not the last time I registered...though I need a new license which I'll be getting a new registration, but thats not till the 27th
"Should I keep back my opinions at such a time, through fear of giving offense, I should consider myself as guilty of treason towards my country, and of an act of disloyalty toward the Majesty of Heaven, which I revere above all earthly kings..." Patrick Henry