Kagi search results say it might have even been three: https://rickdunhamblog.com/2014/04/02/toxic-white-house-water-might-have-killed-three-u-s-presidents-har

Kagi search results say it might have even been three: https://rickdunhamblog.com/2014/04/02/toxic-white-house-water-might-have-killed-three-u-s-presidents-harrison-polk-and-taylor/ https://rickdunhamblog.com/2014/04/02/toxic-white-house-wate...