Jon Favreau @jonfavs
And yet, the results of Iowa have been far more predictive of who wins the Democratic nomination than national polls. So, pretty useful to poll there! — PolitiTweet.org
Nate Silver @NateSilver538
One good reason is that they're reasonably predictive of who wins the primary. About 50-60% of national poll leader… https://t.co/nXAuvQWalC