Fascinating argument and data from Andrew Kohut in WaPo:

In my decades of polling, I recall only one moment when a party had been driven as far from the center as the Republican Party has been today.

The outsize influence of hard-line elements in the party base is doing to the GOP what supporters of Gene McCarthy and George McGovern did to the Democratic Party in the late 1960s and early 1970s — radicalizing its image and standing in the way of its revitalization.