Actually, I'm more concerned about the fraud at the state and local levels than I am about my Congress-critters. It's those bozos in Sacramento that voted for this "Ballot Harvesting" law in 2016, which Moonbat Brown dutifully signed.
Worse yet, the State Legislature, both of which chambers are now so heavily Democrat that even tax and budget bills requiring a super majority to pass does so with no Republicans help needed that come up with and pass these cockamamie laws!
As I read somewhere around here, the U.S. Senators are elected in San Francisco, Los Angeles and Sacramento counties, so my vote in "little" Contra Costa County means little to nothing. Also, my Congressman's district crosses county lines, thanks to gerrymandering approved and endorsed by (you guessed it) the State Legislature, so we get lumped in with parts of the area where you can count Republicans on the fingers on one hand.
I'm seriously considering, for my 2019 ballot, to write-in vote for people like "Charlie Brown", "Lucy Van Pelt", "Clark Kent" and others, just to see if they actually show up in the final tally.
You think you have it bad in COntra Costa COunty...Imagine us folks up here in Jefferson. We have what one state senator to represent some 12 or more counties while the County of Los Angeles has 13 State Senators or something like that. State Senators are allocated based upon population after a court decision in the mid 60s. Really chaps our a$$.