Nate Silver @NateSilver538
More on that state vs. national poll discrepancy. Biden's lead in our national polling average has shrunk from +8.4 pre-conventions to +6.9 now. But in swing states, he's basically unchanged on average, with gains in AZ/MN/etc. offset by declines in PA/FL/etc. https://t.co/LceSE7OC0K — PolitiTweet.org