This is all explained very effectively by blogger Christoper Bird, who is very astute about American politics. (This is interesting because he's Canadian. Oh, and that blog is something of a group effort, but he's the Big Cheese there and posts as MGK.)
So, first this (it's a slideshow, so you'll have to, well, slide your way through it):
And then, as follow-up, this (just normal scrolling now):
1. A lot of responses of "well excuse me I believe I will vote THIRD PARTY" and my response to that is always pic.twitter.com/bqmh7u8ykv
— Aaron Bird, Sir (@mightygodking) July 24, 2016
2. The nature of first-past-the-post systems makes third party voting actively detrimental to the goals of people inclined to do it.
— Aaron Bird, Sir (@mightygodking) July 24, 2016
3. If you're disinclined to vote for either candidate *equally*, then sure, third-party voting makes sense. But you almost surely aren't.
— Aaron Bird, Sir (@mightygodking) July 24, 2016
4. You, like almost everybody, are probably closer in policy preferences to one of the candidates than the other.
— Aaron Bird, Sir (@mightygodking) July 24, 2016
5. For sake of argument, let's say you're likely closer to Clinton than Trump. (If not, why are you reading this? Go watch monster trucks.)
— Aaron Bird, Sir (@mightygodking) July 24, 2016
6. Now let's say "you" is actually "a subset of voters like you, say 1% of the electorate."
— Aaron Bird, Sir (@mightygodking) July 24, 2016
7. If you vote third-party instead of Clinton, there is a set of possible outcomes. *None of them include the third party winning.*
— Aaron Bird, Sir (@mightygodking) July 24, 2016
8. Because FPTP systems are two-party systems, by definition. It's not because of corporate collusion. It's because of *math*.
— Aaron Bird, Sir (@mightygodking) July 24, 2016
9. You are not the first person in history to say "well gosh how about a third party." This is not an original thought you have had.
— Aaron Bird, Sir (@mightygodking) July 24, 2016
10. The reason third parties don't work in FPTP systems is because the system creates two parties with broad bases.
— Aaron Bird, Sir (@mightygodking) July 24, 2016
11. Aside: Canada is a two-party state (the Tories and Liberals) with two smaller parties that split left-wing votes https://t.co/QD303rYeq3
— Aaron Bird, Sir (@mightygodking) July 24, 2016
12. Anyway, mathematically speaking, it makes sense for parties to capture as much of the popular vote as possible.
— Aaron Bird, Sir (@mightygodking) July 24, 2016
13. So FPTP usually creates a political landscape with both parties trying to ensure the support of "51% of the electorate" as possible.
— Aaron Bird, Sir (@mightygodking) July 24, 2016
14. Whatever the reason, conservatives usually all line up in one major party; liberals are more inclined to subdivide.
— Aaron Bird, Sir (@mightygodking) July 25, 2016
15. (This is pretty reliable for FPTP systems across the world, incidentally. It happens again and again.)
— Aaron Bird, Sir (@mightygodking) July 25, 2016
16. (Australia is the major outlier, and their "two" right parties are really just one party for all intents and purposes.)
— Aaron Bird, Sir (@mightygodking) July 25, 2016
17. The result of this is a steady worldwide progression towards more conservative policies, because *conservatives don't split their vote*.
— Aaron Bird, Sir (@mightygodking) July 25, 2016
18. Because conservatives vote with "their" party reliably, the conservative party in Country X With FPTP caters to their preferences more.
— Aaron Bird, Sir (@mightygodking) July 25, 2016
19. And because center-left parties across the world know that the far left is not a reliable vote, they dismiss them to chase the center.
— Aaron Bird, Sir (@mightygodking) July 25, 2016
20. So: if you're voting Green because you don't like Hillary, my posit to you is this:
— Aaron Bird, Sir (@mightygodking) July 25, 2016
21. Voting Green will mean the following things WILL happen.
— Aaron Bird, Sir (@mightygodking) July 25, 2016
22. Firstly, the Democrats are less likely to win, because a voter who is largely aligned with their policy goals isn't voting for them.
— Aaron Bird, Sir (@mightygodking) July 25, 2016
23. Which in turn means: secondly, you increase the odds of a Trump victory, which I assume you *don't* want even more.
— Aaron Bird, Sir (@mightygodking) July 25, 2016
24. Thirdly, if Hillary *does* win, she will be less likely to pursue policies you *would* like, because *you did not vote for her.*
— Aaron Bird, Sir (@mightygodking) July 25, 2016
25. So, by voting third party, you're making every outcome you actually want *less likely*. Which is why voting third party is stupid.
— Aaron Bird, Sir (@mightygodking) July 25, 2016
26. The one thing you *will* get from voting third party, to be sure, is a feeling of satisfaction. (Remember what I said about narcissism?)
— Aaron Bird, Sir (@mightygodking) July 25, 2016
27. Anyway that's enough, I wanna watch wrestling now, Bayley is wrestling and that's very exciting
— Aaron Bird, Sir (@mightygodking) July 25, 2016
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