PHOENIX - For voters, the Arizona presidential primary Tuesday isn't run like any other election on the calendar. Here are three things you need to know if you plan to cast a ballot Tuesday:

Too late to join party: This is what's known as a "closed primary." You have to be a registered Republican, Democrat or Green Party member in order to vote in those parties' primaries.

So for the more than 1 million registered independents in Arizona, if you haven't re-registered with one of the parties by now, you're out of luck. You won't be allowed to cast a ballot at the polling place on Tuesday.

No do-overs on vote: Most votes in Arizona are cast by mail-in ballots. Those ballots were sent to voters four weeks ago. Hundreds of thousands have already been returned.

But now some Republicans have "voter's remorse " - the candidate they voted for, say Marco Rubio or Ben Carson - has dropped out. Despite what Facebook might be telling you, you can't take back your ballot and vote a second time on Tuesday.

Fewer places to vote: If are registered with one of the three parties and plan to vote Tuesday, here's one more thing you need to know: The polling place you usually go to probably won't be open.

There are just 60 polling places open Tuesday in Maricopa County, way down from 200 in the 2012 primary. The good news is you can vote at any one of them. Check with the Maricopa County recorder's website or this link for outside the county for your closest polling place.