What happens when a democracy votes to become Evil

Does the losing Righteous Party accept the will of the people to join the dark side, 

but peacefully campaign extra hard next election to win it back to Not-Evil?

Or will the voice of the people, and the entire democratic process, get kicked to the curb by tyrants believing they are being Righteous?  To what extent can Righteous people justify violent means 'to a Good end', to throw out elections that they lose?  

Living in a democracy means sometimes you lose the vote on things you dont want to happen.

When a nation votes to become Evil, 

what do good or Righteous people do in an Evil society?