The turnout in the 2020 presidential election is around 157 million, compared to around 137 million in 2016. Turnout went from 56% to over 67%.
Donald Trump had 11 million more people vote for him in 2020 than in 2016. That is quite an extraordinary achievement. But Biden had 14 million more people vote for him than voted for Clinton in 2016.
If Trump had got his 2020 vote in 2016, he would have won 342 to 196. He would have picked up Colorado, Maine, Minnesota, Nevada, New Hampshire and New Mexico.
Conversely if Trump had not grown his vote by 11 million, then Biden would have beaten him by 394 to 144. Biden would have also won Florida, North Carolina, Texas and Utah.
So it is a real lesson about the power of turnout. There were not a lot of swinging or undecided voters. It came down a lot to turnout.