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 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).
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.)