Outside of California, The west coast number of voters is simply not as large as the east coast total.
It doesn’t look likely for Romney to take California (it seldom if ever looks likely for the GOP to take California) but the important factor is that the EAST coast where the Dems have their biggest number of votes may suffer from a greatly reduced turnout which should hurt the Dems more then the GOP.
It is interesting to note that the closer you get to either coast the more democratic the vote tends to be. Wonder what impact this might have on the popular vote, and more importantly, places like PA?