In California state-wide elections, Los Angeles and San Francisco don’t control the outcome (otherwise California wouldn’t have recently had Republican governors Reagan, Dukemejian, Wilson, and Schwarzenegger). A vote in rural Alpine county is just an important as a vote in Los Angeles. Los Angeles cannot control statewide elections in California, so it can hardly control a nationwide election.
In fact, Los Angeles, San Francisco, San Jose, and Oakland together cannot control a statewide election in California.
I'm not trying to be disrespectful but more appropriately, might you have said conservative governors? That would eliminate Reagan (gov 36 years ago) and to a small degree Dukemejian and Wilson. My sense is that Duke and Pete were put in office to foment the appearance of balance to their democratically controlled legislatures. The RINO Schwarzenegger was put in out of desperation and what a huge mistake that turned out to be. The point is the demographics and how the politicians have learned to cater (fill their hands using tax $) to those condensed populations in order to establish a foundation of constituents as to maintain their career status as politicians. For example and hypothetically speaking of course, one vote cast in Alpine county is off set 100 fold in LA. Again not to be disrespectful but that's the reality of having elections that are based on popular/populous vote hence the reason our founders established (thank God) the electoral college.