In just a few weeks, voters will be deciding the winners of the New Hampshire and Iowa presidential contests—and who the hell knows what's gonna happen? On the GOP side, Cruz and Trump are fighting it out in Iowa while The Donald still holds a commanding lead in New Hampshire—though polling guru Nate Silver thinks Donald's lack of a decent ground game could be his undoing. Meanwhile, Democrat Bernie Sanders is tight with Hillary Clinton in Iowa and leading in New Hampshire. 

Anyhow, you might not know this, but if you want to vote in Arizona's March 22 presidential primary, you have to be registered with either the Democratic or the Republican Party by Feb. 22. Independents can't just pick a party and request a ballot as they can in the regular federal, state and local contests. You can take care of the paperwork at a bunch of places—libraries, post offices, party HQ and such—or just do it online here.