I was just looking at the RealClearPolitics poll summary page here: Presidential Primary Polls
The polls are just incredibly bad this year. Check these results from the last polls in the completed states:
Alabama:
Last Poll: Trump +23
Result: Trump +21
Georgia:
Last Poll: Trump +19
Result: Trump +14
Kentucky:
Last Poll: Trump +13
Result: Trump +4
Louisiana:
Last Polls: Trump +13, Trump +17
Result: Trump +4
Okahoma:
Last Poll: Trump +13
Result: Cruz +6
Texas:
Last Poll: Cruz +3
Result: Cruz +17
I’m seeing the same thing on the Democratic side, except the polls heavily overrepresented Clinton’s support. For example, in Oklahoma the last poll had Clinton up by +9, when in fact Bernie won the state by 10 points. That’s a huge error. The last Massachussetts poll had Clinton up by 9, and she barely squeaked out a win at +1.5.
On the Republican side, every single poll I looked at was wrong in the same direction: They’re all significantly over-stating the support for Donald Trump. On the Democratic side, most of the polls had too much support for Hillary, but with a couple that went the other way.
In any event, these are not small errors. In some cases we’re talking about 10 point differences - in Oklahoma, a 19 point difference between polling and actual results. That makes the polls there not much better than throwing a dart at a dartboard.
So what’s going on? I don’t buy that it’s just cell phones or some other methodological flaw in the internet era - we’ve got plenty of other polling on other issues that don’t show this huge gap between the polls and reality, and it’s not clear how these issues would always break for the same candidate.
My suspicion is that lots of Democrats are claiming to be Republicans just so they can pump up Trump’s numbers and help him ruin the GOP nomination. But it could also be that Trump’s name recognition is causing people to pick him in casual polling, but when they actually have to pull the lever for him they just can’t do it.
In any event, the polls are really, really wrong this year.