List & explain two reasons why you believe a two party system is better than a multi-party system, or two reasons why you believe the United States would be better off if it moved towards a multi-party system.
Here is a possibility that might go hand-in-hand with a multi-party system. It is true that sometimes that extra party splits the vote and enables someone unexpected to win an election. However, is it possible that this would influence an increase in voting. If people were aware enough to know how much influence a third party had on an election outcome, maybe more people would come out and vote for the candidate of their choice rather than letting others decide it for them.
I like the idea of a multi-party system for the exact same reason that the first responder likes the two-party system. I think it forces the majority to have to respond to the will of the minority more than the current set up we are enduring in the US. Instead of one party profiting from just stopping the other party from doing anything, they have to work together or they can be voted out with a special vote, etc.
On the side of the multi-party system, minority interests get a more representative say in government and the makeup of government. A third party may only get 5% of the votes/seats, but they may be just what's needed to form a coalition government, and therefore get some of what they want in their platform made into policy, as opposed to none of it, which often happens in the two party system. I also like the idea of a Prime Minister being a member of Congress, and having to face them in open debate, as opposed to merely giving canned speeches from time to time.
I'd say a two-party system is better than a mulit-party system because it encourages more moderation (though we're not doing too well on moderation in the US right now, I must admit).
In a two-party system, the parties have to compete for the voters in the middle of the political spectrum. They can't be off on the fringes. In a multi-party system, you can have smaller parties that cater to people who only care about one thing (the 2nd Amendment Party, the Save the Earth Party -- these don't exist, but these are the kinds of things you could have).
I think we're better off if we have parties that have to have "big tents" that embrace as many people as possible.