[There was a] massive D sweep [in] 2018
Excuse me, what?
I think they meant in terms of the House popular vote, which was D+8.6%. By that metric, 2018 was a blue wave year.
But we are not concerned with nationwide statistics here; we are concerned with statewide polling. From the perspective of statewide statistics, 2018 was not an exceptional year for Democrats; they lost a net of two Senates seats (gained Arizona and Nevada; but lost Florida, Missouri, Indiana, and North Dakota---the first three of which Democrats were expected to win) and lost multiple gubernatorial races they were expected to win, namely Ohio and Florida.
