It is obviously fair enough for people not to trust polls, as you remember when they are wrong, but you are less likely to remember when they are right.
If you take the UK for example, the polls were wrong in 2015 by overestimating Labour/underestimating the Tories, depending on how you look at it. The 2017 election went the other way a bit, and underestimated Labour. The 2019 election in the UK was pretty much polled correctly. There may have been coverage of a load of people chanting about Jeremy Corbyn, but he was always behind.
Polling companies change their weightings and their methodologies between each election in order to fix these errors. They do so because there is no money in political polling, it is just a high profile way to advertise how accurate they can be.
The US pollsters could be wrong again, but it is not likely that they would be wrong in exactly the same way (by underestimating the Republicans/overestimating the Democrats).
Specifically for the US, my understanding is that the pollsters went wrong with the undecided voters, and estimated that many would not vote and that those who would vote would split in a certain way between Trump and Clinton. As it happens, more than they estimated DID vote, and more than they estimated voted for Trump.
This time, the number of undecided voters is lower, and of those undecided voters, it is estimated that most are not so likely to vote for Trump or vote at all.
The estimations could still be wrong of course. Trump's voter base could have completely changed, or people might switch at the last minute, or people simply might not bother to vote at all. Biden is hardly an inspiring candidate in anyone's eyes really, so I would guess that the last possibility is one that Trump is hoping for.
On balance though, it isn't looking great for Trump.
If you take the UK for example, the polls were wrong in 2015 by overestimating Labour/underestimating the Tories, depending on how you look at it. The 2017 election went the other way a bit, and underestimated Labour. The 2019 election in the UK was pretty much polled correctly. There may have been coverage of a load of people chanting about Jeremy Corbyn, but he was always behind.
Polling companies change their weightings and their methodologies between each election in order to fix these errors. They do so because there is no money in political polling, it is just a high profile way to advertise how accurate they can be.
The US pollsters could be wrong again, but it is not likely that they would be wrong in exactly the same way (by underestimating the Republicans/overestimating the Democrats).
Specifically for the US, my understanding is that the pollsters went wrong with the undecided voters, and estimated that many would not vote and that those who would vote would split in a certain way between Trump and Clinton. As it happens, more than they estimated DID vote, and more than they estimated voted for Trump.
This time, the number of undecided voters is lower, and of those undecided voters, it is estimated that most are not so likely to vote for Trump or vote at all.
The estimations could still be wrong of course. Trump's voter base could have completely changed, or people might switch at the last minute, or people simply might not bother to vote at all. Biden is hardly an inspiring candidate in anyone's eyes really, so I would guess that the last possibility is one that Trump is hoping for.
On balance though, it isn't looking great for Trump.