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we don't have to register, just state which party you wish to vote on in the primary.

Thank goodness it isn't that simple here. There are controls in place that keep one political party from having its members turn out en masse to vote for their preferred candidate in the other political party's Primary. This ensures that both political parties are able to nominate and vote on the individuals who will be the party representative in the General Election without manipulation/fraud by the other party.

Jim.