This is the mindset that needs to change in order for initiatives like Prop 19 to pass. [An anecdote]

I was in California last week and struck up a conversation with a guy during a smoke-break (cigs). Somehow he brought up the fact that he was a libertarian and for the "legalization of all drugs". "Awesome!", said I, "well you must be excited for Prop 19.". After a grimace he went on to explain to me that he was on the fence. Despite being ideologically for the proposition, he had struggled with controlling his marijuana use in the past and was worried that legalization might make him give into his cravings. Of course, I pointed out how ridiculously incompatible this was with his formerly expressed libertarian philosophy and he agreed that it was illogical, but that he was struggling with it personally.

Here's my main beef with this: voters need to understand that they are not voting only for themselves. One does not vote to validate ones personal beliefs or philosophies. One votes for the creation of laws and policies that will be to the benefit of all (or most). Don't like gay marriage? Fine. You can dislike it and still accept that others might benefit from it. Don't like pot? Fine. I don't like smoking pot, but I accept that others do and I don't benefit from sending them to prison.

TL;DR You don't vote for yourself, you vote for everyone.