You have undoubtedly heard that primary polls aren’t necessarily very predictive far from an election. With just a month to go until the Iowa caucuses, I’m writing to tell you that … it’s still true.
Yes, even with that little time left until Iowa, the first contest of the 2016 race, there’s more than enough time for candidates with little or no support to surge to victory, for forgotten former front-runners to mount a comeback, or for strong and consistent poll leaders to collapse abruptly. CONT.
Nate Cohn, New York Times