IS RICK SANTORUM running for president of the United States, or isn’t he? I caught him by phone on a people mover at Dulles Airport and posed the question: He’s not running, then again, he’s not NOT running. En route to South Carolina Tuesday to stump for gubernatorial candidate and Republican Rep. Gresham Barrett, Santorum wasn’t being cagey, just practical. Whether the former Pennsylvania senator can raise the millions needed for a presidential bid remains to be seen. In the meantime, he has some things to say. For starters: “I have no great burning desire to be president, but I...