Sen. Bernie Sanders and former Vice President Joe Biden

Sen. Bernie Sanders and former Vice President Joe Biden face off in the Democratic Presidential Preference election March 17.

And then there were two.

Where once there were at least a dozen hoping to lead the land, the field of Democrats running president dwindled to Sen. Bernie Sanders and former Vice President Joe Biden.

The Democrat Presidential Preference election is Tuesday, March 17. Those who mail ballots are advised to do so as soon as possible.

The rules, according to Maricopa County Elections Department (

• The polls are open on Election Day from 6 a.m. to 7 p.m. Check voting location hours if you plan to vote early.

• If you vote in person, you must vote at your designated polling location or at a Vote Center.

• Every qualified voter is required to show proof of identity (Arizona driver’s license or identification card or tribal identification card) at the polling place before receiving a ballot.

• Any voter requiring assistance may bring a person of the voter’s choice into the voting booth. Two poll workers of differing political parties may also assist the voter in casting a ballot.

• All qualified voters in line at the polls by 7 p.m. on Election Day shall be allowed to cast a ballot.

• All photographs and electioneering must be done 75 feet outside poll.

Voting centers include:

• Avondale City Hall, 11465 W. Civic Center Drive, Avondale.

• Buckeye City Hall, 530 E. Monroe Avenue, Buckeye.

• Christ Community United Methodist Church, 104 W. Western Avenue, Avondale.

• Glendale Community College, 6000 W. Olive Avenue, Glendale.

• El Mirage City Hall, 10000 N. El Mirage Road, El Mirage.

• There will be drop boxes at Goodyear City Hall, 190 N. Litchfield Road, Goodyear, and Maricopa County Elections, 510 S. Third Avenue, Phoenix.