In CA they will fight like hell to prevent it from ever being investigated. And why would they block an "open" voting process from being investigated? A scandal in its own right.
The Heritage Foundation is a think tank, not a primary source. Do you know of any primary sources?
The article you linked to talks about election fraud (i.e. the rigging of an election), not voter fraud (i.e. a ballot voted by one who is ineligible to vote).
Sure. Study the history of leftists like Lenin and Stalin and see how they got their "votes". Works the same way in California. And just like in the Soviet Union, you'll never be able to see the voter data to prove it, because communist governments will not allow that.
You have to actually think outside the ballot box to figure it out.
I have seen no evidence to believe that the Californian government is actively suppressing access to voter data for the purposes of covering up a scandal. If you have some, I'm all ears. (Or eyes, as it may be.)