Otherwise, the majority gets all the power, and there's no chance for an elected opposition group to keep the majority honest. Then we should use the Instant Runoff. We can get the job done in one. The Instant Runoff, used in Ireland, Australia and Cambridge, Mass., works the same way a runoff election does, but doesn't require a second election. Voters rank the candidates in order, giving a '1' to their first choice candidate, a '2' to their second-choice and so on.
Voters can rank as many or as few candidates as they'd like.
If someone gets a majority of the Number 1 votes, then that candidate wins. He or she wins. If no candidate gets a majority of the Number 1 votes, the candidate in last is eliminated and all of his or her ballots are switched to those voters' Number 2 ballots. This is just like a regular runoff election. The difference is that in the Instant Runoff, you can vote for your second choice by giving him a '2', just in case your first choice gets eliminated.