It doesn't matter. The candidate has to prevail only by one more vote in enough swing states respectively-- to carry them to 270. 75,000 votes in those 3 states was a huge gap the way it works out.
Look at it this way: In a naval battle it isn't the side that sinks the most ships that wins, it is the side that that sinks the right ships that wins. Hillary didn't prevail in the right places she needed to, and Biden doesn't appear to be doing much better in enough swing states right now either. I'd say mostly due to a really poor VP pick in Kommisar Harris. Had Biden picked Whitmere or Klobachar, I think his task would have been much easier. Isn't like California, Illinois, New York, New Jersey, and Massachusetts would not have voted for Biden had he picked other than a Black female anyway, so why did he box himself in that way? Biden's VP choice make little sense at the top of the ticket, but maybe it is about the down ballot more than anything else? Biden ONLY came in to block Sanders as Sanders would have lost more down ballot elections than anyone else in running.
I believe the polls are way off the mark this time. I admit, they weren't too far off for Hillary in 2016 on a national basis; she was ahead by about 3 points and then won 2 million more popular votes. But I strongly believe that this year is different, people cannot be honest in polls---especially Democrats in swing states, and I believe there will be a "Tom Bradley affect" come November and Trump will win all the same swing states--maybe even pick up one or two more.
Bradley effect - Wikipedia
Harris is the absolute correct VP candidate. The idea that a Klobuchar or Whitmer would carry a state is a quaint and outdated idea. Its rare that a local VP candidate makes a difference with a specific state. Moreover, Biden is going to win those states anyway, Michigan running away. The key to winning as a democrat is black turnout. If Biden picked a white woman in 2020, he would have shot himself in the foot with the black vote, especially in the BLM year. That said, Harris is a bull-dog that gets to be more aggressive than Biden in prosecuting the case against Trump. She will drive Trump nuts and force mistakes on his part because he can't control himself.
The idea that the polls are "way off the mark" is nothing more than wishful thinking on your part. Though, its better to have wishful thinking than no thinking at all, you really have no basis for your claim. If you do, I would love to hear. This not 2016:
1. Trump is not the unknown insurgent here to break the Washington cycle of power between the Bushs and Clintons. In fact, Trump is a polarizing figure, with 40% that will vote for him not matter what and 45% that will not vote for him under any circumstances. Given that most polls have only 5-6% unaccounted for, there are about 9-10 that have generally made up their minds and could change, but not likely. Trump just doesn't have much to win over.
2. In 2016, people that liked neither Clinton nor Trump broke nearly 2 to 1 to Trump. This time, those that like neither have gone 4 to 1 to Biden
3. In 2016, we had a strong economy and healthy people. We had not lost nearly 200,000 people, most of which as a result of presidential negligence.
4. Just before election day, Comey's letter to US Senators letting them know that he had re-opened the Clinton investigation was leaked by Republican senators, which threw a wrench into the Clinton election machinery.
5. Trump won by depressing the democratic vote in WI and MI. Since 2016, Democrats have gone to the polls in numbers that are greater than the polling assumptions, so they have tended to win by bigger margins than forecast. No reason to think Democrats would be caught flat-footed again.
6. Biden's lead is much larger and stronger the Clinton's, with far less undecideds.
Why Biden’s Polling Lead Is Different From Clinton’s In 2016 | FiveThirtyEight
We have very few surprises of election results to polls, though we all get your wishful thinking for another Trump inside straight. Its not likely to happen. As of now, its a 71-28 proposition that Biden wins. Yes, that is almost exactly where it was when Trump won. Trump had an outside shot in 2016 and pulled it off. He could do it again, but not likely. But, like Russian roulette, you pull the trigger once , it goes, you re-load the gun, that chance of 1 in 6 is still 1 in 6.
2020 Election Forecast | FiveThirtyEight