Some numbers:
2016:
R P. Tiberi (i) 66.6% 243,970
D E. Albertson 29.9% 109,455
G J. Manchik 3.5% 12,848
-------------------------------------
Total 366,273
Today:
50.2% Troy Balderson GOP 101,574
49.3% Danny O'Connor Dem 99,820
0.6% Joe Manchik GP 1,127
-------------------------------------------
Total 202,521
So 55% of 2016 turnout. Exceptionally high.