Experts think turnout is going to be massive. "Experts in both parties believe that as many as 15 million to 20 million more people could turn out for this presidential race than the 139 million who voted in 2016."

That would be the highest turnout among eligible voters in more than 100 years, since before women could vote.

Even split. Nonvoters are pretty evenly split between Republicans and Democrats, according to studies Brownstein cites. Even if Sanders has a slight advantage, generally, among nonvoters, the nonvoters in Rust Belt states might skew more toward Trump.

Appeal to swing voters. It's the same as it ever was. Sanders' campaign pollster, Ben Tulchin, tells Brownstein that Sanders can make, perhaps, a more convincing economic argument than other candidates to swing voters in swing states.

Sanders' argument against Trump goes like this, Tulchin tells Brownstein:

Rigged economy benefiting Trump: "Our case is Trump is a product of the rigged economy, he doesn't pay his workers fairly and he doesn't pay his fair share of taxes -- he takes that money and buys himself the presidency to give himself and his billionaire cronies a tax cut while trying to take away health care from working people.

People are still "pissed off" by corrupt politicians. "Bernie can say I'm going to stand up for you: better wages, health care, lower prescription drug costs. And if we can prosecute that case -- what we see [is gains] with more downscale independent voters -- who get pissed off by corrupt politicians."

Old Sanders audio vs. old Bloomberg audio

You can imagine he'd modulate that in this Democratic primary.

And he keeps saying the same things today. Support for some literacy programs in authoritarian regimes? Sure! Other politicians modulate.

What Sanders won't ever say. Truth-speaking has its limits. He will not admit that he cannot pass what he promises in the current political environment. He's authentic in his ideology, but not publicly realistic. Bloomberg is the opposite.

Biden's problems won't be solved by one win

Can't just win with black voters -- This South Carolina voter who talked to CNN's "New Day" explained, better than any pundit you'll see anywhere, why even if former Vice President Joe Biden wins on Saturday in his firewall state, he's still got huge problems:

"I think a lot of people felt like ... he was a sure bet," says a black South Carolina voter about Joe Biden. "He was a unifier. Thus far he's been in two of the whitest places in the country and he's lost miserably."

One more note about Trump and coronavirus

What are we doing here?

The American system of government has been challenged to deal with a singular President and a divided country that will decide whether he should get another four years in the White House.

Stay tuned to this newsletter as we keep watch over the Trump administration, the 2020 presidential campaign and other issues of critical interest.