Elections, parties and pressure groups

Political Science · Government and institutions. The idea in plain words, the rules to remember, the mistake to avoid and a worked example, written and checked by Mega Lecture.

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The idea

An electoral system turns votes into seats. Under first past the post each constituency elects one member, and the candidate with the most votes wins, even without a majority. Under proportional representation each party's share of seats is close to its share of votes.

Political parties seek to win office. They choose candidates, combine many demands into a programme, form the government or the opposition, and educate voters. Party systems are one-party, two-party or multi-party.

Pressure groups do not seek office. They try to influence those who hold it, on behalf of an interest or a cause. Lobbying is one of their methods: direct contact with legislators and officials to shape decisions.

Rules to remember

Common mistake

A majority of seats is not a majority of votes. Under first past the post a party can win most constituencies narrowly and govern with well under half of the national vote.

Worked example

In a constituency under first past the post, A gets 38,000 votes, B 34,000 and C 28,000. Who wins, and did the winner have a majority?

  1. Total votes = 38,000 + 34,000 + 28,000 = 100,000.
  2. A has the most votes, so A wins the seat.
  3. A's share = 38,000 ÷ 100,000 = 38%, which is less than 50%.

Answer: A wins with a plurality of 38%, not a majority; 62% of voters chose other candidates.

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