What kind of voting system normally is most likely to lead to a two party political system?

In political science, Duverger’s law holds that single-ballot plurality-rule elections (such as first past the post) structured within single-member districts tend to favor a two-party system. [T]he simple-majority single-ballot system favours the two-party system.

Is proportional representation constitutional?

— U.S. Constitution, Amendment XIV, section 2 The Constitution provides for proportional representation in the U.S. House of Representatives and the seats in the House are apportioned based on state population according to the constitutionally mandated Census.

What is proportional representation and how does it work?

More and more politicians in the UK are pitching for a move to proportional representation (PR), an electoral system in which the overall vote share a party wins determines the number of seats in the legislature.

Should we replace first past the post with proportional representation?

However, our voting system has failed to keep pace. We believe that First Past the Post has no place in a modern democracy, and should be replaced by a system of Proportional Representation. If you agree, sign the petition. If you want to know why, read on:

Do tiny parties have a lot of power under proportional representation?

It’s sometimes claimed that under proportional representation (PR), tiny parties have a lot of power, as they get to decide who to go into coalition with and therefore who forms the government. Under First Past the Post (FPTP), these people say, the party that the biggest share of the vote gets to be in power.

Do parties win more seats if they lose votes?

On the other hand when a party loses votes, it should win fewer seats. But with First Past the Post, it often doesn’t work like this. In most of our general elections since WWII, at least one of the major parties has either gained votes but lost seats, or lost votes but gained seats.