The linked article by Krugman today and this one yesterday by Tom Friedman point to a glaring fact: the Republican Party has drifted to the real fringe of reality and sensibility. If the electorate follows any Republican nominee, heaven help us all.
As someone who grew up Republican, I have some knowledge of the Republican party as it used to be. Back then, a tussle developed between the "conservatives" and the "moderates" ("liberals" if you're from the New York or New England), and the winner, like Richard Nixon, had a foot in both camps; ditto Jerry Ford. Even Reagan, for all his reputation, was more pragmatic than his legend reveals. But since Regan & old Bush, it's all crazy. Gone are the days of Mark Hatfield and Charles Percy (both of whom died this year). This book review addresses this lost party.
Now we have a no-nothing party. Not that free market perspectives, low taxes, and a strong military are necessarily bad, but from where the current party is coming from, it's just nuts.