Primary Elections

What is a primary election and how does it work?

Are presidential primary elections held in every state?

Can a U.S. citizen living outside the country vote in primary elections?

Is there a calendar with deadlines for U.S. primary elections?

How can I register for my state's primary election?

Do I have to choose a party affiliation when I register to be eligible to vote in a primary election?

If I'm registered as an Independent, Green, Libertarian, or other third party, can I still vote in my state's primary?