In Australia it is compulsory for people over 18 to vote but I know that none of the bhikkhus or bhikkhunis here vote, I assume it would be the same for other countries too. My understanding is that their training is aimed at leaving the world, so why would they want anything to do with trying to control the world (eg. politics). The best person to ask about this would be a monk.
Personally I "donkey" vote which is a legal way of not supporting any political party in Australia, ideally I would like to opt out of even turning up at the booths.
Four types of letting go:
1) Giving; expecting nothing back in return
2) Throwing things away
3) Contentment; wanting to be here, not wanting to be anywhere else
4) "Teflon Mind"; having a mind which doesn't accumulate things
- Ajahn Brahm