Nate Silver is Not God and other political musings
Submitted by brad on Wed, 2012-11-07 22:07In the wake of the election, the big nerd story is the perfect stats-based prediction that Nate Silver of the 538 blog made on the results in every single state. I was following the blog and like all, am impressed with his work. The perfection gives the wrong impression, however. Silver would be the first to point out he predicted Florida as very close with a slight lean for Obama, and while that is what happened, that's really just luck. His actual prediction was that it was too close to call. But people won't see that, they see the perfection. I hope he realizes he should try to downplay this. For his own sake, if he doesn't, he has nowhere to go but down in 2014 and 2016.
But the second reason is stronger. People will put even more faith in polls. Perhaps even not faith, but reasoned belief, because polls are indeed getting more accurate. Good polls that are taken far in advance are probably accurate about what the electorate thinks then, but the electorate itself is not that accurate far in advance. So the public and politicians should always be wary about what the polls say before the election.
Silver's triumph means they may not be. And as the metaphorical Heisenberg predicts, the observations will change the results of the election.
There are a few ways this can happen. First, people change their votes based on polls. They are less likely to vote if they think the election is decided, or they sometimes file protest votes when they feel their vote won't change things. Vice versa, a close poll is one way to increase turnout, and both sides push their voters to make the difference. People are going to think the election is settled because 538 has said what people are feeling.
The second big change has already been happening. Politicians change their platforms due to the polls. Danny Hillis observed some years ago that the popular vote is almost always a near tie for a reason. In a two party system, each side regularly runs polls. If the polls show them losing, they move their position in order to get to 51%. They don't want to move to 52% as that's more change than they really want, but they don't want to move to less than 50% or they lose the whole game. Both sides do this, and to some extent the one with better polling and strategy wins the election. We get two candidates, each with a carefully chosen position designed to (according to their own team) just beat the opposition, and the actual result is closer to a random draw driven by chaotic factors.
Well, not quite. As Silver shows, the electoral college stops that from happening. The electoral college means different voters have different value to the candidates, and it makes the system pretty complex. Instead of aiming for a total of voters, you have to worry that position A might help you in Ohio but hurt you in Florida, and the electoral votes happen in big chunks which makes the effect of swing states more chaotic. Thus poll analysis can tell you who will win but not so readily how to tweak things to make the winner be you. The college makes small differences in overall support lead to huge differences in the college.
In Danny's theory, the two candidates do not have to be the same, they just have to be the same distance from a hypothetical center. (Of course to 3rd parties the two candidates do tend to look nearly identical but to the members of the two main parties they look very different.)
Show me the money?
Many have noted that this election may have cost $6B but produced a very status quo result. Huge money was spent, but opposed forces also spent their money, and the arms race just led to a similar balance of power. Except a lot of rich donors spent a lot of their money, got valuable access to politicians for it, and some TV stations in Ohio and a few other states made a killing. The fear that corporate money would massively swing the process does not appear to have gained much evidence, but it's clear that influence was bought.
I'm working on a solution to this, however. More to come later on that.
Ballot Propositions
While there have been some fairly good ballot propositions (such as last night's wins for Marijuana and marriage equality) I am starting to doubt the value of the system itself. As much as you might like the propositions you like, if half of the propositions are negative in value, the system should be scrapped. Indeed, if only about 40% are negative, it should still be scrapped because of the huge cost of the system itself.