You post a link to the Arizona voter registration website that makes not a single reference to what you said and consider that proof. Must have figured no one would actually look!
It really doesn't make much difference whether they can do it on election day or have to do it 29 days prior they still do it in droves and that is how McCain has always been nominated!
Perhaps you didn't push the one big button on the page. Try it and find...
Voter Registration Applications must be completed 29 days prior to an election in order to be "registered to vote in that election."and
Use EZ Voter registration to:
Register to vote for the first time
Update your address, political party preference, permanent early voting status or any other information on your voter registration record
To check the status of your voter registration, click here
TOTAL BS! You do not know what your are talking about.
ANY registered voter can walk into a GOP poling place on primary day and declare that they wish to vote in the GOP primary and do so.
I have proven you wrong and even though NOW "It really doesn't make much difference," a grown up would say "I concede your point. Thank you for correcting me."