There are similarities between the national GOP (Reagan) coalition of today and the old national Dem (FDR) coalition in 1968.
In 1968, LBJ — a sitting president — had come under such attack by the left wing of his own party that he refused the nomination. LBJ wasn’t progressive enough.
So Nixon (and later Reagan) peeled away southern conservatives and others and made a new national governing coalition.
And the Democrats made a frowny face and the left wing split into a bazillion different identity politics flavors. They held onto the House … for awhile. And the GOP made the U.S. all fascisty.
Now the GOP has made the U.S. such a comfortable homeland for the hard right, they think that JEB BUSH is not conservative enough.
That’s (slang) crazy (not clinical) (probably). So their candidates are numerous and (politically) bonkers.
Their coalition is whipsawed from attacking the president for being “weak” while also denouncing Trump — sometimes — and refusing to even debate a war declaration in Congress. And gun violence and etc.
So the national GOP coalition looks done, except for the House, for awhile.