Primary rules are established state by state. In Illinois I was not registered with either party and was able to request whichever ballot I wanted in a primary. In California the Democratic Party allows crossover voting in the primary if you vote in person (as opposed to absentee ballot) but the Republican Party does not.
Oh see, I find that interesting. In NJ you must declare to vote in a primary. I believe you can actually go to the poll and declare there (at least that is what I was told at one time by someone who was calling to get voters out).
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