Conservative votes are more depressed in California than liberal ones for the same reason that liberal votes are more depressed in Utah than conservative ones. Despite being a big factor it doesn't all have to do with the presidential election. Unless a superstar like the Governator is running Cali is likely to have a dem for Governor and most offices will be dominated by dems. If Californians votes had mattered individually for the presidential election it seems to me that the gap between Trump and Clinton would have narrowed there not expanded. In a similar scenario in Utah it seems likely that democrats would have narrowed the vote gap.
If we look at swing states in this election, places where people feel that their vote carries weight in the presidential election, it is clear that Trump was able to motivate his supporters much more so than Clinton. Trump won swing states that could barely be called that. States that lean heavily toward the democrats. This turnout meant that the republicans were not only able to win the presidency but also both federal houses, and many local races that they may have otherwise lost.
Clinton supporters are looking at the national popular vote total that was gathered in a system in which it does not matter and drawing what I think are fanciful conclusions. The depressing truth may very well be that if we decided the POTUS election by national popular vote that Trump would have won anyway.