Nah, not how I remember it.It's obviously not the fault of the Democrats how the Republicans have moved and I haven't argued that. But the Democrats had an opportunity to seal this. The only reason the Christian right endorsed Trump was specifically for this purpose (e.g. get those Justice picks in).
I think the Democrats saw Obama's tenure as one which had broken the Republican party and perhaps got lax. I remember their being a lot of chatter at the time that the Republicans had lost their base vote (or that it was no longer enough).
The Republican party had their influx of The T-Party and thought they could control their noise by offering them a few crumbs from the captain's table'.
Not realising the moment they validated them and gave them a voice the jig was already up.
All the looney came out and the tail started wagging the dog.
The Democratic looney left saw what was going on and formed behind their unelectable poster boy.
All similarities between the US and UK are purely coincidental.