Here's what USA Today reported regarding voter enthusiasm and election turnout:

Midterm elections, when turnout is traditionally low, are all about getting voters engaged enough to actually go the polls and vote. In the USA TODAY survey taken Friday through Sunday, there's sobering news on that front for Democrats. Just 35% of Democratic and Democratic-leaning voters said they were “more enthusiastic than usual” about voting in November. That's down eight percentage points from May and a precipitous 22-point drop from the poll we took in March.

In fact, it's the lowest level of enthusiasm for Democratic voters since 1998.

Here's the historical context USA Today left out: Democrats actually picked up seats in the 1998, the last time voters enthusiasm was this low.