"I get asked on a regular basis, 'Boy, why aren't you running this year?' I ask myself that a lot too. But I did that once," Romney said. He made self-deprecating jokes about his loss to President Barack Obama in 2012, borrowing a line from Democrat Walter Mondale, who lost to Ronald Reagan in the 1984 presidential election: "All my life I wanted to run for president in the worst way, and that's what I did." He laughed about how much fun he had running in the 2012 race, encouraging the audience at an event hosted by the U.S. Chamber...