A week after 14 states participated in Super Tuesday, voters in six states now head to the polls in what's become a two-way race between former Vice President Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE and Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) for the Democratic presidential nomination.

Biden is looking to extend his delegate lead over Sanders, while the Vermont independent is aiming to keep his campaign alive.

Polls close as early as 8 p.m. EDT in the Midwest and as late as 11 p.m. EDT on the West Coast, although full results in some states might not be tallied for days.

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Here is when polls close in all six states.

Idaho: 10 p.m. EDT (11 p.m. EDT in nine northern counties)

Michigan: 8 p.m. EDT (9 p.m. EDT in four counties)

Mississippi: 8 p.m. EDT

Missouri: 8 p.m. EDT

North Dakota: 8 p.m. EDT

Washington: 11 p.m. EDT