OK, soon things will get real. So I want to take a look at the Iowa polls.
I have taken the polling averages from Fivethirtyeight, Realclearpolitics and 270 to Win and made this table:
As you can see, the order of the candidates is pretty much the same, but 538 see Sanders and Biden much closer than the other two. Nevertheless, they are undoubtely close, and as a caucus the result in Iowa is extremely hard to predict. That is especially true, as voters for candidates that don't reach 15% at their polling station realign to another candidate. This can mess up these polls pretty strongly.
I also took a screenshot of the graphs 358 and RCP provide, as these show the momentum very well:
Fivethirtyeight also has a model for the primaries. Take this with a grain of salt, as it is their first primary model, primaries are harder to model anyways (and a caucus like in Iowa even more so). Anyways, the model shows a high amount of uncertainty in any case. Fivethirtyeight uses a Monte Carlo statistics model, where they run simulations with slight changes in variables according to known uncertainties each time. Of a lot of these simulations they take an average. But 80% of these simulations show Sanders between 2 and 22 delegates in Iowa. 10% have him with even fewer delegates, 10% with more. This is an enourmous range and shows the uncertainty the model holds. And this is true for all candidates, not only Sanders. So take this with an enourmous pile of salt.
Anyways, the model has Sanders winning most delegates in 41% of the simulations, Biden in 35% of the simulations. Buttigieg has 14% chance and Warren 11% chance to win the most delegates. Klobuchar wins in 3% of the simulations and everyone else falls even below that.
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