I vote in national elections, because I will most likely live in this country my entire life and know the candidates. I typically don't vote in local elections, because I rarely live in a certain area for longer than a few years, and this is unlikely to change until I settle down into a stable career. Furthermore, I'd have to research local candidates more, because there is less press on them.
Who do you live with, or do you live alone?
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"Ignorance may be bliss, but knowledge is power."