In Ohio, a turnout advantage for Democrats
As Leah mentioned, ABC News now projects that Ohioans have voted to add protections for abortion to their state constitution. According to estimates from the New York Times, the abortion referendum in Ohio is on track for a +15 point "yes" margin. Compared to a partisan benchmark of Ohio — the 2020 election — that's a 23 point "swing" for Democrats, since they lost by 8 in 2020. Yes, I know, this is not exactly an apples-to-apples comparison, but it's not the topline I'm interested in anyway. Rather, I'm looking at the results of ABC News's exit poll, which preliminarily shows that Trump only won the people who turned this year out by 3 points back in 2020. Back-of-the-envelope calculations suggest about 5 points of the Democrats' 23 point swing is due to a turnout advantage, then. The rest of it is due to residual overperformance of abortion as an issue.
The upshot here? Democrats are continuing a pattern of beating expectations in off-year elections, likely due to a concentration of highly engaged, educated voters in their coalition. We may be looking at a new era of off-year Democratic overperformance.
—G. Elliott Morris, 538