You kind of alluded to the problem of voting as it pertains to larger groups of people. This is especially problematic with government. The larger the country, the more problematic simple majority voting becomes because of the way our government is constructed. In our current system, if 50.01% of the people (Or electoral college) vote for a leader, that leader is given the power of that office and is able to do what her/she likes. The other half of the population just has to sit there and take it. In a country as large as the United States this means that whole large groups can be effectively ignored because they aren't needed to get the necessary votes to win. And I'm not sure that a system that is structured to leave a 150 million or so of it's citizens disenfranchised is a good system. Leaving aside of course that the winning side usually doesn't get what it wants in terms of campaign promises either.