It'll be here before we know it: The next Iowa caucus poll takes place in May 2018

An early sampling that Public Policy Polling started in 2010.

And the results will be meaningful only in the sense of telling us who, for the most part, doesn't have a prayer.

First poll source:  Public Policy Polling

Caucus results source:  Des Moines Register

First poll source:  Public Policy Polling

Caucus results source:  Des Moines Register

(Santorum won by 34 votes.)

Other afterword posts:

"The state of Iowa has spoken", more softly than in meaningful elections.  (2/2/2016)
"The state of Iowa has spoken": Caucus winners from 2008, 2012 and 2016.  (2/2/2016) 
Donald Trump's shocking loss in Iowa caucuses: Not so much.  (2/2/2016)