Demographic changes + Romney voters dying off en masse since 2012
Not sure if this is a joke based off my post, but my point is the vast majority of Romney voters in wealthy suburban counties across the country were Trump voters. It only takes a relatively small chunk defecting or staying home plus continued demographic change to make a very big difference.
Well, that’s obviously true, but did anyone really deny this? Anyway, I wouldn’t say that only a small chunk defected in 2016 given the absurdly large D swing from 2012. The county also swung + trended R in 2012, so I’m not sure if continued demographic change was the most relevant reason here like you seem to suggest.