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Electoral and Party Systems: Definition & Role

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  • 0:02 The Dominance of the…
  • 1:13 How Electoral Systems…
  • 2:41 The Logic of Electoral Systems
  • 4:10 Laws Favoring Two Parties
  • 5:28 Lesson Summary
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Lesson Transcript
Instructor: Jason Nowaczyk
The following lesson will define and explain the role of the United States' electoral system and how it affects the shape of our party system. A short quiz will follow the lesson to check for your understanding.

The Dominance of the Two-Party System

Two hundred years is a pretty lengthy amount of time for anything to last. It would be rare for you or I to live even half that long. But while you and I may not live for two centuries, the things we produce may.

Our two-party system, specifically the version dominated by the Democratic and Republican parties, will most likely continue to outlive us for some time. It has already existed for some 200 plus years. How then have the two parties been able to remain so dominant?

One of the reasons why two major parties have retained most of the power in the United States is because of our country's reliance on a winner-take-all electoral system, which is also known as a plurality electoral system. At virtually every level of government in the United States, the outcome of elections is based on the person who obtains the most votes, even if that person didn't receive a majority of the votes.

How can you get the most votes but not a majority? A majority is defined as 50% plus 1. If there are three candidates, one candidate could get 40% of the votes while the other two only get 30% each, in which case the first candidate would win without a majority. In other words, whoever gets the most votes gets everything.

How Electoral Systems Are Set Up

In a plurality system, only those candidates who finish at the top are declared the winners and are awarded with representation in the government, while losing contenders are left on the outside. By their very nature, plurality electoral systems encourage two-party governments.

But not all political systems work this way. Imagine you are playing the lottery. Of course, you would feel much better about your chances if it was only you and one other person playing versus being one among many other people. However, some people might want to hedge their bets and play against many competitors rather than risk the finality of a winner-take-all scenario. In other words, they would prefer to play the version of a lottery that rewards you even a little bit even if you don't get all the numbers, because at least you won something.

Similarly, many countries employ an electoral system known as proportional representation, where there is more opportunity for reward than in a plurality. In a proportional representation electoral system, each candidate has an opportunity to gain representation in the government and the amount they get is proportional to the percentage of votes they received in an election. So, in our previous example, the political party that won 40% of the vote would still get greater representation in government, but the political parties that each won 30% would have some representation rather than being completely eliminated.

The Logic of Electoral Systems

But because the United States has a plurality electoral system, a certain logic is set up in the minds of politicians and voters against the presence of third parties. For example, politicians know that a winner-take-all scenario presents little chance for small parties to win, so they form broad coalitions and gather diverse constituencies, or voter support and interests, within one party. Politicians, in other words, want to appeal to the greatest number of people as possible to increase their probability of winning because they know that there is no award for second place.

Similarly, voters do not like to waste their vote on likely losers, so in a plurality electoral system, voters will throw their support behind the most viable candidates rather than support smaller parties with little chance of success, even if they feel that the smaller parties better represent their values.

However, in a proportional representation electoral system, there is an incentive to form parties based on specific ideologies or common interests. This is because politicians in these systems want to appeal to their strongest voter bases, because even a small share of the vote can be rewarded with legislative representation. Being a voter in a proportional representation system also leads to a different mindset because, in this type of system, a voter can feel free to vote based on their ideologies and interests and won't feel like they are throwing away their vote for a candidate who has little chance of winning.

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