Lawrence O'Donnell explains to Rachel Maddow how the California voting process and a massive number of candidates has California Democrats thinking on many levels to ensure they elevate the candidates they want without inadvertently splitting their own vote to the benefit of a Republican candidate.

Exactly when and how votes are counted in California can give misleading indications that a candidate is ahead.

With a glut of mail-in ballots and cushy timeline for counties to process them, learning who wins California races can be quite the waiting game.

California primary results may take weeks due to mail voting laws, sparking criticism from analysts like Nate Silver who call it embarrassing.

It might be awhile before Californians know the results of some significant races this election, given the state’s notoriously slow counting.

An election interference scandal has already rocked California as a voting site was vandalized and burned mail-in ballots were found in a drop box. The incidents, which officials described as isolated but serious,

Strong majorities of registered Democrats and independents in California are confident that local election officials will ensure this week's primary vote is safe and accurate, but far fewer registered Republicans share that confidence,

It’s a somewhat different story in Los Angeles, where a reality television personality is running for mayor as the city prepares to host the Olympics. More primaries are being held on Tuesday as well.