If you want to vote for TRUMP in Arizona’s Presidential Preference Primary on Tuesday March 22, 2016 you have to be a registered Republican as ONLY Republicans can vote for Trump.
March 23, 2016, the day after the Presidential Preference Primary you can change your registration back to your desired political preference – it’s like voting twice as it sends a message – your game, your rules.
If you need to register as a Republican it’s strongly suggested you register as early as possible to assure your change of status to Republican actually occurs. Here is the list of contact information for County Election Officials:
Contact Information for County Election Officials