Iowa Entrance Poll Finding: Democratic Caucus-Goers Lurch Sharply Leftward in 2016, Republicans Less Conservative

Photo by Joe Raedle/Getty Images

An unquestionable, and entirely predictable ideological shift in the Democratic Party was confirmed by the Iowa entrance poll on Monday night. The first such poll to be conducted in eight years revealed that Democrats, or at least those willing to turn out for a night time caucus in Iowa, have become decidedly more liberal since their last meeting in 2008.

The fact was captured not only in the final vote count, which found a self-professed socialist virtually tied with a former Iraq War supporter, but turned up in black and white in the poll taken of Iowa Democrats as they entered their caucus site.

To be sure, there was an abundance of evidence that the Democratic Party was shifting ideologically leftward prior to the Iowa entrance poll. Since Bernie's campaign announcement last April, multiple surveys found a plurality of Democrats viewing socialism favorably - even more favorably then their views of capitalism. Routine political polling from the likes of Gallup and Pew Research also picked up on the increasingly liberal bent of the party. But caucus-goers confirmed the movement, and to an unmistakable degree.

The Predictive Power of (Very) Early Presidential Primary Polling Part I - Historically Unreliable

Colin Powell was grabbing headlines as a potential candidate for President in 1996 as early as 1993. Though he never actually led Dole in primary polling until just before he announced he would not be a candidate in November of 1995.

Though the 2016 presidential primaries won't officially get under way for another two years, the shadow campaign is upon us, as indicated by the flourish of recent polls and articles on the subject.  And the tea leaves for both parties couldn't be more different; for Democrats, the race appears to be Hillary's to take - if she wants it, while the Republican race is anyone's guess.

Hillary Clinton, should she decide to run, looks poised to wrap up the Democratic nomination in one fell swoop, as early polling has shown her very strong in the Democratic primary - stronger, in fact, than any candidate in a contested primary dating back to 1976.

Republican primary polling has been a bit more topsy-turvy to date, featuring no less than five different leaders over the last year (making it awfully reminiscent of the 2012 primary process). Those leaders have been Ted Cruz, Chris Christie, Paul Ryan, Rand Paul, and Marco Rubio:

In spite of the deluge of early primary surveys since last year's election, there are many who find the early speculation premature at best, or entirely futile at worst. “But early primary polling isn’t predictive of actual primary results!” is a frequent refrain for the many that abhor such early conjecture about an election that’s still three years away.

So in an attempt to settle the issue, I decided to take a look at the predictive power of Democratic and Republican Presidential primary polling from 1976-2012. And there were more than a few surprises.

Note, Nate Silver did something similar a few years ago, though if you click on the link, you'll see his focus was on polling one-year out from the start of actual primary contests. This piece will examine the predictive power of those polls two and three-years out from the start of the contests (where such polling data is available).