Arguably, that is the key takeaway from the latest round of polling. See the chart below, which was commented on as follows by Geoffrey Skelley on 538:
"[One] thing to note here is that Biden is above 50 percent in Pennsylvania, Michigan and Wisconsin. This is significant because even though Hillary Clinton led in these states at points in 2016, she never crossed the 50 percent threshold. That speaks to just how durable Biden’s lead might be.
But perhaps what’s even more significant about this batch of recent polls is that Trump’s possible Electoral College advantage is slipping. Biden doesn’t lead by as much in most of the battleground states as he does nationally, but his leads are big enough — anywhere from 5 points in Arizona to 9 points in Nevada — that it won’t matter that many battleground states lean to the right of the country.
Take Biden’s leads in Pennsylvania, Michigan and Wisconsin. Those three Frost Belt states were each decided by less than 1 point in the 2016 election, yet Biden leads them all by at least 8 points. That gives him a firmer grip on the Electoral College. The race, of course, could narrow in the coming months, but as the Times/Siena surveys found, Biden also has a sizable edge in states such as Arizona and Florida, which means even if his position weakens in the Midwest — perhaps some white Republican-leaning voters come home to Trump — Biden’s strength in other parts of the country might be less affected and still give him a path to victory with 270 electoral votes."