At the heart of Shor’s frenzied work is the fear that Democrats are sleepwalking into catastrophe. Since 2019, he’s been building something he calls “the power simulator.” It’s a model that predicts every House and Senate and presidential race between now and 2032 to try to map out the likeliest future for American politics. He’s been obsessively running and refining these simulations over the past two years. And they keep telling him the same thing.

We’re screwed in the Senate, he said. Only he didn’t say “screwed.”

In 2022, if Senate Democrats buck history and beat Republicans by four percentage points in the midterms, which would be a startling performance, they have about a 50-50 chance of holding the majority. If they win only 51 percent of the vote, they’ll likely lose a seat — and the Senate.

But it’s 2024 when Shor’s projected Senate Götterdämmerung really strikes. To see how bad the map is for Democrats, think back to 2018, when anti-Trump fury drove record turnout and handed the House gavel back to Nancy Pelosi. Senate Democrats saw the same huge surge of voters. Nationally, they won about 18 million more votes than Senate Republicans — and they still lost two seats. If 2024 is simply a normal year, in which Democrats win 51 percent of the two-party vote, Shor’s model projects a seven-seat loss, compared with where they are now.