As readers of this thread know, I'm posting poll results week by week as Election Day approaches. My purpose is to document the poll results on certain dates so we can see how accurate or inaccurate the polls were after the votes are counted.
There is a wrinkle, however. It's the unusually high volume of early voting.
This Forbes article provides the numbers and an informative discussion. With early votes being returned in high numbers weeks before Election Day, it may not tell us much about poll accuracy. The votes that will be counted will not be cast just on Election Day but in the weeks before. We can look at the polls published a day before Election Day and know those numbers. But it appears a whole lot of ballots will be cast long before then.
If the early voting "turnout" reported by Forbes is an indicator, the Democrats have the edge. But that may mean little. We have no way to know if the Republicans will show up in force to vote in person on Election Day or close to it.
I think the Republicans may be hurting themselves by encouraging their voters to vote in person. Long lines at voting locations are already commonplace. It they continue, that may discourage many people of all parties (or no party) from going to vote. With Democrats clearly outvoting Republicans by wide margins where early-vote ballots are now being turned in, it will be more important than ever for Republicans to physically show up, or to quickly change their minds about participating in early voting as the Democrats are.
Another consideration is the invalid ballots cast by early voters. A certain percentage of those ballots will be disqualified for lack of a signature, failure to follow the instructions, etc. How many? I don't know, but
this article about the rejected Florida primary mail-in ballots is instructive.
Is this a possible development? A significant number of Republicans who planned to go in person to vote on Election Day hear news of long lines. They've also heard news, consistently in preceding weeks, of Biden's commanding leads in the polls (produced in part by Republicans who lied to pollsters and said they would vote for Biden). Feeling discouraged and not motivated to stand in a long line to vote for a a losing candidate, they conclude their vote won't matter and they stay home.
Note: that last paragraph is pure speculation. I'd be interested to hear speculation about a Trump victory that explains how the Republican vote will be strong enough to pull that off.