What gave you your first clue?
If you read the entire article, the unstated fart in the elevator is that Democrats were the ones to jump on eugenics as a "scientific" justification for segregation, miscegenation, colored drinking fountains and bathrooms.
I'll admit to the fantasy of using democrat voter roles as a proscription list. I also think using them all as the first colonists to Omicron Persei 8 should at least be considered.
You can delude yourself however you want, but the fact remains that eugenics was adopted by both parties.
Eugenic sterilization was imposed throughout the country. The Nazis modeled many of their laws after California and California was pretty solidly Republican until the 1970s. Oliver Wendell Holmes, Jr. was a Republican.