NY Times: as of 9/24, Obama has an 81.9% probability of winning

[ute4ever]

17 of the past 18 candidates who lead in the polls with 45 days remaining, won the election. The lone loss was Dewey to Truman.

http://fivethirtyeight.blogs.nytimes.../?ref=politics

The Statistical State of the Presidential Race
By NATE SILVER
With fewer than 45 days left in the presidential campaign, it’s no longer a cliché to say that every week counts. And there are a few polling-related themes we’ll be watching especially closely this week.

This is probably about the last week, for instance, in which Mitt Romney can reasonably hope that President Obama’s numbers will deteriorate organically because of a convention bounce. That is not to say that Mr. Obama’s standing could not decline later on in the race, for any number of reasons. But if they do, it will probably need to be forced by Mr. Romney’s campaign, or by developments in the news cycle, not the mere loss of post-convention momentum.

We’ll also be looking to see if there is a greater consensus in the polls this week. In general, last week’s numbers started out a bit underwhelming for Mr. Obama — suggesting that the momentum from his convention was eroding — but then picked up strength as the week wore on.

Still, there were splits among the tracking polls and among other national surveys; between state polls that called cellphones and those which did not; and among pollsters who came to a wide variety of conclusions about whose supporters were more enthusiastic and more likely to turn out.

But before we get lost in the weeds, let’s consider a more basic question. What did the polling look like at this stage in past elections, and how did it compare against the actual results?
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