ROFLMAO!!!!!
California independents can cast ballots for Democrats — but not Trump — in March primary
California Tries to Keep Trump off Primary Ballot
Fixing err... rigging the choices for Independents?
The reason independents can vote for Dems and not Reps in Cali primaries is because the Cali GOP doesn't allow it. It's up to each party to decide who can vote in their primaries. Your own article explains this.