Klys?
Take a look at this could ya? Looks like I can vote the Dem primary but not the GOP to vote against trump without registering GOP. I hope there are a few Indy California voters here. The rules are a tad confusing

http://lavote.net/Documents/Election_Info/06072016_Political-Party-Reminder.pdf

If you registered with no party
preference, you can vote in the
Presidential primary for the
following parties:
• Democratic
• American Independent
• Libertarian