[quote=“Mike_Mabes, post:220, topic:922525, full:true”]
is the first part possibly true? If so, do pollers adjust for it?
[/quote]Yes. traditionally, conservatives are less willing to answer polls than liberals. Anecdotally, I have heard several pollsters saying this trend is accelerating recently. Part of that likely is that historically, working-class voters are harder to poll, and the GOP is trending working class while the Dems trend professional class.
The two main ways pollsters account for this are either weighting (where you more or less simply put more weight on the answers you did get from whatever group you think you undercounted) or just calling more and more of that group until you get a sufficient number.
The problem with that, of course, is you have to start asking yourself whether the people of said group willing to answer your poll are truly representative of the larger group. And you really can’t know the answer for sure.
Of course, the same problems hold for ALL polling, especially nowadays when response rates are very low (<10%). Anyone willing to spend 30 minutes on a weeknight talking to a stranger is by definition a very atypical person. There are various strategies for mitigating this (e.g. polling online, etc), but at the end of the day people who don’t like being polled don’t get polled, and there’s no polls-based-solution to that.
There is of course, other, non-polling data.
Historically, incumbents that are unopposed in their party and nonetheless have good primary turnout win reelection. Trump had excellent primary turnout, and one model based on this has him at 91% likely to win. https://spectator.org/helmut-norpoth-trump-win-november/
In 2018, there was a lot of coverage of the Democrats’ success in registering new voters. That was smart, because historically, the party that’s been doing better in new voter registration wins elections. In 2020, the GOP has been registering more voters.
Voter enthusiasm can be measured, and every measurement goes in favor of Trump.
For that matter, poll questions like “who do you expect to win” or “who are your neighbors voting for” are historically better predictors of actual results than who respondants say they themselves are voting for. (Though it’s not a long history). Those poll questions favor Trump.
In fact pretty much every kind of data you can use to predict an election says Trump wins, maybe by a lot … and yet topline question on the polls say the exact opposite.