He’s going to transform the party — by turning us into hawkish Democrats? Nuance. There’s a bigger point — and this initial volley, they say, lays the groundwork for it. They will be sharpening McCain’s message that he, not Obama, is the true change agent, a man who’s repeatedly taken unpopular stands, made the hard calls and forged bipartisan alliances. Part of the calculus now is how his VP choice will further sharpen that message. There is significant support among top McCain advisers that he make a “transformative” pick who would change the Republican Party — someone who would appeal...