I think it started with the Democrats purging pro lifers in the 1970’s and accelerated with the Republicans who purged anyone who looked cross-eyed at any of their core special interests.
About the author
Harry is a ferociously good natured eccentric in Duluth Minnesota who detests traitors dressed up as Uncle Sam. You can find somewhat better edited writings of his at the Duluth Reader "contributors." page. The URL is:https://duluthreader.com/contributors/h/84/284-harry-welty