Today one of the most anticipated days in politics before November's midterm elections. Eight states are holding primaries: Alabama, California, Iowa, Mississippi, Montana, New Jersey, New Mexico and South Dakota.

Poll hours in each state vary but are listed below. CBS News will bring you full coverage of all the primary results as we confirm them. In the meantime, here's everything you need to know about Tuesday's primary elections.

How to watch Tuesday's midterm primaries

What: 2018 Primary election day

2018 Primary election day When: Tuesday, June 5, 2018



Tuesday, June 5, 2018 States: Alabama, California, Iowa, Mississippi, Montana, New Jersey, New Mexico and South Dakota

Alabama, California, Iowa, Mississippi, Montana, New Jersey, New Mexico and South Dakota Live results: Election results live blog and online stream

Watch online: CBSN live stream



When are polls open today?

Alabama: 8 a.m. to 8 p.m.

8 a.m. to 8 p.m. California: 10 a.m. to 11 p.m.



10 a.m. to 11 p.m. Iowa: 8 a.m. to 10 p.m.



8 a.m. to 10 p.m. Mississippi: 8 a.m. to 8 p.m.



8 a.m. to 8 p.m. Montana: 9 a.m. to 10 p.m.



9 a.m. to 10 p.m. New Jersey: 6 a.m. to 8 p.m.



6 a.m. to 8 p.m. New Mexico: 9 a.m. to 9 p.m.



9 a.m. to 9 p.m. South Dakota: 8 a.m. to 8 p.m.



*all times Eastern

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House of Representatives primary race

Democrats will need to flip 23 seats in Republican-held districts in order to gain control of the House in 2018. CBS News rates 13 of the House districts facing primary elections on Tuesday as "very likely" or "probably" competitive this fall.

States with House candidates on the ballot

California

New Jersey

Iowa

Senate primary race



States with Senate candidates on the ballot:

California: incumbent Sen. Dianne Feinstein, a Democrat, faces challenge from the state Senate leader Kevin de León;

incumbent Sen. Dianne Feinstein, a Democrat, faces challenge from the state Senate leader Kevin de León; Mississippi: incumbent GOP Sen. Roger Wicker is running for re-election, and the nonpartisan special election to replace retiring Sen. Thad Cochran takes place on Nov. 6;

incumbent GOP Sen. Roger Wicker is running for re-election, and the nonpartisan special election to replace retiring Sen. Thad Cochran takes place on Nov. 6; Montana: Republican voters will determine who will challenge incumbent Sen. Jon Tester;

Republican voters will determine who will challenge incumbent Sen. Jon Tester; New Jersey: incumbent Democratic Sen. Bob Menendez, who was plagued by scandal



Gubernatorial primaries

Five of the states having primaries today also have candidates for governor on the ballot.