Tomorrow will see the closest election in the UK for many years and there is considerable debate about whether tactical voting is acceptable (see here, here, here). This is a particularly big issue this election as the Liberal Democrats (the UK's third largest party) have had a significant rise in popularity and the vote looks to be split fairly evenly among the three parties. A three-party race causes significant problems for the 'first past the post' voting system used in the UK and the US, as it means that a party can win a seat even if 60% or 70% of the people in the seat think that it is the worst option. For example, suppose that a seat has the vote split as follows:
40% — Conservatives
38% – Liberal Democrats
22% – Labour
The Conservatives would win this seat even if they were the third choice of all the Liberal Democrat and Labour voters. In such a case, the Labour supporters might realise that they have relatively little chance of winning and that they can avoid a worst-case scenario by voting Liberal Democrat. Voting for a party that is not your preferred party is known as tactical voting and is quite contentious.
Read More »Is it wrong to vote tactically?