Early voting and absentee ballot returns show little change from 2016 percentages (Trump won counties are performing a little better than 2016):

Trump won counties are turning out at almost 1/2% better and Hillary won counties are the opposite.  Not good news for the blue wave since Donald Trump won Tennessee by 16 points (61% to 35%).

Zooming in on the counties, we can see things are pretty flat from last year to this year (although as in all mid-terms volume is down across the board):

The big take away is that there either is no “jump” in Democrat enthusiasm or whatever jump Democrats had was matched and exceeded by Republicans.