There shouldn’t be much question about whether 2018 was a wave election. Of course it was a wave. You could endlessly debate the wave’s magnitude, depending on how much you focus on the number of votes versus the number of seats, the House versus the Senate versus governorships, and so forth. Personally, I’d rank the 2018 wave a tick behind both 1994, which represented a historic shift after years of Democratic dominance of the House, and 2010, which reflected an especially ferocious shift against then-President Barack Obama after he’d been elected in a landslide two years earlier. But I’d put 2018 a bit ahead of most other modern wave elections, such as 2006 and 1982. Your mileage may vary.
In another important respect, however, the 2018 wave was indisputably unlike any other in recent midterm history: It came with exceptionally high turnout. Turnout is currently estimated at 116 million voters, or 49.4 percent of the voting-eligible population. That’s an astounding number; only 83 million people voted in 2014, by contrast.