you also could take the bull by the horns and contact your State Board of Elections (or Dept. of Elections depending on what it's called) and ask them ((without saying you're a Paul supporter)) what you have to do. They will tell you.
Some states...you just show up at the caucus and volunteer at the end...some states you have to get petitions signed and get elected....EACH STATE CAN BE DIFFERENT but...they will tell you. So atleast this way you'll have an idea going in. If the Campaign contacts you...great..you'll get even more info...if they don't get a chance to...you'll still know what you need to do =)
Much Luv and Respect =)
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