Rick Santorum the senator didn’t shy from controversy. Apparently, neither will Rick Santorum the presidential candidate. The former senator from Pennsylvania speaks and acts like a man working diligently to become a dark-horse favorite for president. Dark is the operative word: During an hour-long interview with National Journal last week at a busy coffee shop just blocks from the Capitol, no one appeared to recognize the potential presidential candidate. Santorum is making up for his low profile by taking aim at better-known potential rivals: former Alaska Gov. Sarah Palin and former Massachusetts Gov. Mitt Romney. In a race where nobody...