Registration is only really relevant in primaries. In some states, you cannot participate in a primary election unless you are registered with that party. And this isn’t true in every state. Some of them do not allow this restriction either.
In the “real” election, anyone can vote for anyone. You can even write in people who didn’t run or can’t legally hold office. You can vote for animals or fictional characters or foreigners. That doesn’t mean they can actually take office. But there are no restrictions on you being able to vote for them.
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