The weather in Iowa is no joke. And it could affect turnout.
If you're looking for a wild card that could shake up the Iowa caucuses, check the weather. Iowa has experienced a succession of brutal winter storms including heavy snow, high winds and seriously cold temperatures over the past week. The low for tonight in Des Moines is forecast to be -8 degrees (without wind chill).
I spent last week on the ground in the state, and if you're tempted to reply, "It's Iowa, they're used to this," allow me to disabuse you of that idea. The state was largely shut down over the weekend. Canceled flights, no campaign stops, many roads were undrivable and people were advised to stay indoors. The National Weather Service noted that weather of this type is experienced just once or twice per decade. All of this is to say, after hunkering down for days and now facing arctic temperatures, don't be surprised if some Iowans who'd planned to caucus stay home tonight.
There's some debate over how low turnout could affect who shows up to the caucuses. On one hand, Trump supporters register as more enthusiastic than those of other candidates. On the other hand, Trump's supporters tend to be more marginal voters who don't vote as regularly as some other parts of the electorate. He does disproportionately well among people who say they plan to caucus for the first time, a group that may also be the first to say, "actually, I'm not braving the cold to spend hours in a high school gymnasium." On top of that, Trump's supporters also tend to be more rural, which may mean having to confront less-navigable roads.
Iowa voters brave freezing temperatures for decisive caucus
So keep all that in mind as the results come in and pour out a hot cuppa for the Iowans venturing out in the cold tonight.