JUST IN: Sister of the Dayton mass shooting suspect and her boyfriend have been found dead in a car, law enforcement officials say, and they had both been shot – @PeteWilliamsNBC / @jonathan4ny https://t.co/CVFLdVrvzW
— NBC News (@NBCNews) August 4, 2019
He was a registered Democrat, last voting as a Democrat in 2018. You can check it under the Green County, Ohio voter lookup here. There is no indication that politics had anything to do with his actions as of now. But he wasn’t pro-Trump or GOP, from what it appears.
His mother also had an “smash the alt-right” post on her Facebook.