9.2 The two-party system

Learning objectives

By the end of this section, you will be able to:

• Describe the effects of winner-take-all elections
• Compare plurality and proportional representation
• Describe the institutional, legal, and social forces that limit the number of parties
• Discuss the concepts of party alignment and realignment

One of the cornerstones of a vibrant democracy is citizens’ ability to influence government through voting. In order for that influence to be meaningful, citizens must send clear signals to their leaders about what they wish the government to do. It only makes sense, then, that a democracy will benefit if voters have several clearly differentiated options available to them at the polls on Election Day. Having these options means voters can select a candidate who more closely represents their own preferences on the important issues of the day. It also gives individuals who are considering voting a reason to participate. After all, you are more likely to vote if you care about who wins and who loses. The existence of two major parties, especially in our present era of strong parties, leads to sharp distinctions between the candidates and between the party organizations.

Why do we have two parties? The two-party system    came into being because the structure of U.S. elections, with one seat tied to a geographic district, tends to lead to dominance by two major political parties. Even when there are other options on the ballot, most voters understand that minor parties have no real chance of winning even a single office. Hence, they vote for candidates of the two major parties in order to support a potential winner. Of the 535 members of the House and Senate, only a handful identify as something other than Republican or Democrat. Third parties have fared no better in presidential elections. No third-party candidate has ever won the presidency. Some historians or political scientists might consider Abraham Lincoln to have been such a candidate, but in 1860, the Republicans were a major party that had subsumed members of earlier parties, such as the Whig Party, and they were the only major party other than the Democratic Party.

Election rules and the two-party system

A number of reasons have been suggested to explain why the structure of U.S. elections has resulted in a two-party system. Most of the blame has been placed on the process used to select its representatives. First, most elections at the state and national levels are winner-take-all: The candidate who receives the greatest overall number of votes wins. Winner-take-all elections with one representative elected for one geographic district allow voters to develop a personal relationship with “their” representative to the government. They know exactly whom to blame, or thank, for the actions of that government. But these elections also tend to limit the number of people who run for office. Otherwise-qualified candidates might not stand for election if they feel the incumbent or another candidate has an early advantage in the race. And since voters do not like to waste votes, third parties must convince voters they have a real chance of winning races before voters will take them seriously. This is a tall order given the vast resources and mobilization tools available to the existing parties, especially if an incumbent is one of the competitors. In turn, the likelihood that third-party challengers will lose an election bid makes it more difficult to raise funds to support later attempts.