This may be the link you wanted

https://digbysblog.blogspot.com/2018/05/the-overton-window-at-work-by-tristero.html

I find fault with this in that I think it is backward thinking presuming the parties will always stay the way they were during boomers' lifetimes. I think the old Overton window has been shattered and that Trump is a catalyst. But it is not just him, it's happening allover the world that political parties are breaking up along new lines and fronts.

It wasn't so long ago that we had very different political parties in this country, two of them bearing the same names of parties of today, but not the same at all, and there were also others. In that context, I actually think it's kind of hidebound thinking to expect that they will stay the same with only a slight shift of an Overton window here and there. Times they are a changing, both new coalitions and breaking apart of old ones are overdue to happen. From all the polls I've read on it, most Millennials don't give a damn if you are a Republican or a Democrat, but do care about where pol is on the conservative to liberal spectrum on individual issues. And whether synchronicity or serendipity, the internet affords the "buyer" the knowledge of where each pol is on individual issues.