You mean it's so self-evident that you can't point to any single example? I see.
If you live in California, rogue yam, it won't really matter much to the rest of the world whether you vote for Romney or Obama in November. You really don't even have a vote that could possibly affect the outcome, do you?
You're the only one stuck with living inside your head so it's your job to keep yourself sane. Do what you feel is right. Vote for your favorite candidate. If you like Romney, go for it.
But, if you live in California, don't try to convince folks that you're doing it because you think it's necessary to help beat Obama.
You just don't ever say anything honest, do you?