Nate Silver @NateSilver538
A Georgetown/Battleground live-caller poll showing Biden up 13 lends some credence to the theory that Trump's apparent gains in the polls may partly reflect mode effects. (That is, not many live-caller polls lately but lots of IVR & online polls). https://t.co/cy51vc5isJ https://t.co/dURp7joLsq — PolitiTweet.org