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Gary Johnson is back. You might remember him best as the scrappy long-shot Republican presidential candidate who made a "dog poop" joke from the far end of the debate stage in Florida last year. Perhaps his name rings a bell as the only Republican not named Ron Paul who supported marijuana decriminalization. Or maybe you recall that he's a super athlete and super thrifty: He climbed Mount Everest and vetoed more than 700 spending bills over his two terms as governor of New Mexico. In December, Johnson shook off his official affiliation with Republicans when he joined the Libertarian Party. Over the weekend, the organization nominated him as their party's candidate for president. And now that Johnson is no longer affiliated with the GOP, the usually soft-spoken, unassuming politician has come forward guns-a-blazing. With a tougher tone and a sharper message delivery, the 58-year-old has re-emerged as a rabble rousing attack dog. One of his pithier...