5/17/2021 UPDATE: After initial publication of this article on 5/16/2021, I noticed that I neglected to include instances from the 2010, 2012, and 2014 elections where three House incumbents lost by double-digits. As of 6:45pm PST on 5/17/2021, I corrected Visual 1, Table 1, and the writing below to account for this. I also changed some of the notes below Visual 1 and Table 1.
