In some states it matters, because how you are registered determines the Primary ballot you can vote on - if you're a Dem, you get to vote on the Dem's for the Primary - likewise for the Repubs....I tried being an Independent once (in Oregon) and found this out the hard way - couldn't vote for Dem or Rep....
Well, they do keep telling me that the ballot I choose is what determines how I'm registered, which I guess is what you've said. So if I just keep choosing a republican ballot, then I guess that's how I'm registered. It does seem to be different for different states, maybe they're telling me the truth, but I just don't trust them (hmmm, wonder why...).
Thanks for the advice!