I know less about this stuff than I'd like to, but if I were one of the media/university polls that consistently skews 4-8 points too Democratic in the age of Trump,
and I was genuinely interested in more accurate polling... I'd need to figure out ways to more effectively reach the lower propensity working class voters in the rust belt and swing states that we keep missing.
These people, especially white voters who fit this profile, are the hardest to reach. From what I've heard,
these voters are 50 times less likely to respond to a pollster than high propensity/highly educated voters, regardless of ideological or party preference.
Unfortunately,
the only truly effective way I can think of to reach enough of these voters to include them as an accurate representation of the electorate in your sample,
is to spend 50 times as much time, 50 times as much effort, and most importantly 50 times as much money to survey them, as it takes to survey your high propensity/highly educated voters.
And for these hardest-to-reach voters the most effective way to reach them (more so than online panels, for example) is still a good old fashioned
person to person phone call, which is, of course,
the most expensive way to survey voters, at a cost of around $35 or more for a single completed survey. If these people are 50 times harder to reach, imagine how much more money it costs to poll a comparable number of them compared to your leftwing professor who always votes and actually likes sharing his opinions with a pollster.
For most of the media/university polls, even if they wanted to do this, they don't have the funds to spend on it like an internal pollster financed by a campaign might.
And even if i do manage to survey enough of them, because they are so much harder to reach and to survey, I would have to overcome my natural inclination (based on the way they used to be pre-Trump) to dismiss them as unlikely voters anyway.
Vance in '28