Took me all day but I did the math for mass shootings/voter precincts. prelim results manually eyeballing, entering addys and screencapping each and every single shooting and precinct. Error margin +/- 3.5%

~ 85% of mass shootings occurred in precincts that voted for Hillary Clinton in 2016

~ 85% of mass shootings occurred in precincts that voted for Hillary Clinton in 2016

~ 85% of mass shootings occurred in precincts that voted for Hillary Clinton in 2016

Majority of mass shootings occurred in mostly Democrat precincts in all but four states.

Two of those were tied. Only two were Republican majorities.

sauce1:

https://www.google.com/maps/d/u/0/viewer?mid=1jl901ZAtyFSXvVsoRAxkMP_V2S-nM7-Z

sauce2:

https://www.nytimes.com/interactive/2018/upshot/election-2016-voting-precinct-maps.html?smid=fb-nytimes&smtyp=cur#4.06/39.07/-96.92/113253