Mitt Romney has put a lot of work into reversing the perception, prevalent during his 2008 campaign, that his ideological compass only follows the magnetic field of whichever electorate he happens to be trying to win over. The title of his campaign book, No Apology, was as much a statement of principle as it was a potshot at the (entirely fictional) bowing and scraping Obama has done overseas. He’s refused to cede an inch on the merits of his Massachusetts health reform program, despite the incredibly inconvenient fact that Democrats cribbed from it when they wrote their national overhaul. And...