California in Pres elections if Bay Area was similar to other metropolitan areas

[rob in cal]

It seems to me that one of the bedrocks of Democratic victories in Presidential (and other state wide races as well) is that the San Francisco Bay Area is Democratic both in its urban core, and wealthier suburban outer areas. In most American urban areas we find a liberal urban core, such as Detroit, Chicago, St Louis, Houston whatever, but this heavily Democratic area is usually at least partially  neutralized by a conservative suburban area so the overall vote count isn't so strongly Democratic.
   In the Bay Area, this neutralization effect is not in play, as the wealthier suburaban counties of San Mateo, Marin, Santa Clara and Contra Costa still lean Democratic to varying degrees, so the overall effect is a massive surge to the Democrats from the entire Bay Area.  I'm wondering if anyone has done a study called "if Bay Area counties voted like other similar counties elsewhere in the country".  My guess is that California would go from sure Democratic state to leans Democratic.