Until fairly recently, stuff line anti-vax was far more common on the left. There used to be a joke that it's fairly easy to find concentrations of anti-vaxxers

Until fairly recently, stuff line anti-vax was far more common on the left. There used to be a joke that it's fairly easy to find concentrations of anti-vaxxers in US - you just need to plot locations of Whole Foods on the map and then draw a circle around each. (To be fair, though, this was never mainstream in the Democratic party the way these things are now among the Republicans.)