This did not occur in the "suburbs," but in the Central West End neighborhood, smackdab in the City of St. Louis. Many of the streets there are private. I have friends who live near this couple, and the residents of their private street had a private security company stopping people from entering without permission.
It's been a while since I lived in St. Louis, but it would surprise me greatly to find Republicans in this neighborhood. Sure enough, I read elsewhere, these two are Democrats and have contributed to Democrat candidates. He's a lawyer (no surprise there - these houses cost a fortune).