How to watch the last major six primaries
Voters in six states -- California, Montana, New Jersey, New Mexico, North Dakota and South Dakota -- are casting their ballots in the Democratic or Republican races for president. North Dakota is holding Democratic caucuses only.
Hillary Clinton and Bernie Sanders are the main candidates on the Democratic ballot. Donald Trump is now the presumptive GOP nominee, and Hillary Clinton clinched the Democratic nomination Monday evening.
- Watch CBSN at 7 p.m. ET for coverage of the Republican and Democratic primaries
Sanders on Monday evening did not acknowledge AP or network reports noting Clinton had reached the 2,283 delegates needed to ensure the nomination was hers. Instead, he stayed on message, telling voters in his final San Francisco rally Monday that he would go to the Democratic convention if he wins California.
Most of the states except Montana are either holding closed or semi-closed primaries. California is holding a semi-closed primary in which independents can only request a Democratic Party ballot, while people wanting to vote in the GOP primary must be registered Republicans. New Mexico operates under a closed primary system in which registered Democratic or GOP voters can only cast ballots in their respective party. North Dakota is only holding caucuses for the Democrats Tuesday. In South Dakota, independents can vote in the Democratic primary race while the GOP primary is closed to Republicans. New Jersey is a semi-closed primary in which only registered Democrats and Republicans and voters who are independents or unaffiliated can cast ballots. Montana's primaries are open to any voters.
Poll open/closing times:
New Jersey: 6 a.m. to 8 p.m. ET
New Mexico 7 a.m. to 7 p.m. MT (9 a.m.-9 p.m. ET)
Montana 7 a.m. to 8 p.m. MT, smaller polling sites open at noon (9 a.m.-9 p.m. ET)
North Dakota 7 p.m. MT (Democratic caucuses) (9 p.m. ET)
South Dakota 7 a.m. to 7 p.m. MT (9 a.m.-9 p.m. ET)
California 7 a.m. to 8 p.m. PT (10 a.m.-11 p.m. ET)
In the Democratic race, 694 delegates are up for grabs. California and New Jersey have the most at stake with 475 delegates and 126 delegates, respectively.
In the Republican race, 303 delegates are at stake, but it doesn't matter much because Donald Trump is the presumptive nominee and has already clinched the required 1,237 delegate threshold needed to win the nomination. His nomination doesn't become official, however, until the Republican National Convention in July.
Washington, D.C. is the last place to hold a primary, which takes place on June 14. Tuesday's six primary contests come after Clinton won the U.S. Virgin Islands and Puerto Rico over the weekend.
While it looks like Clinton will almost certainly win New Jersey, the race between Clinton and Sanders is much tighter in California. A CBS News Battleground Tracker poll released Sunday says 49 percent of Democratic voters in California back Clinton while 47 percent support Sanders.
Clinton is positioned, however, to secure enough delegate support to clinch the nomination on Tuesday night. It's unclear if and when Sanders would drop out since he has insisted that he plans to go all the way to the convention.
→What: Democratic and GOP primaries in California, Montana, New Jersey, New Mexico, North Dakota, South Dakota
→ CBSN election coverage begins at 6 p.m. ET
→ Where: Six states
→ When: Polls will be open as early as 6 a.m. ET and will close as late as 11 p.m. ET in California
CBS News' Catherine Cannon, Katiana Krawchenko and Donald Judd contributed to this report.