The libertarian case in favor of voting for Libertarian Party presidential nominee Gary Johnson is pretty self-evident and exceptionally strong. 
Johnson, a former two-term Republican governor of the overwhelmingly Democratic state of New Mexico, is not just the single-most qualified candidate the LP has yet to field for president. At this stage in his life, he's got more experience in managing actual political reality and bureaucratic state operations than the one-term former governor Mitt Romney has or the wet-behind-the-ears senator Barack Obama had when he moved into 1600 Pennsylvania Avenue. Or for that matter, Rep. Ron Paul (R-Texas) had when the good Dr. No ran for the LP in 1988.
As a bonus as big as the Mt. Everest that he actually climbed (on a recently busted leg, for god's sake!), Johnson actually happens to be a full-throated champion of strictly limited government and maximally empowered individuals, of free minds and free markets, of marriage equality, engagement with the world through trade not aid (or drones or boots on the ground), of open borders, of social tolerance, and more. (Go here for Johnson's platform.) When he was running the show in the Land of Enchantment, he held the line on spending and taxes and vetoed hundreds of bills while pushing school choice, prison reform, competitive outsourcing, and many other good things. He never once threatened to invade Texas or Arizona or Colorado, or even Mexico.
Lord knows that finding experienced and comitted-to-the-cause candidates hasn't always been easy for the LP. Four years ago, the party nominated former Rep. Bob Barr (R-Ga.) a notorious social conservative, war hawk, and drug warrior who embraced libertarian values only after being bounced from the House due to redistricting shenanigans. Even as the LP's standard bearer, Barr was not fully at ease with the non-interventionist foreign policy that's deep in the party's roots as an emanation of right-of-center dissent from Vietnam. When LP is not putting forward recent and sometimes-ambivalent converts, it has a knack for anointing folks who may not quite be ready for their day in the sun. In 2004, the LP put forward Michael Badnarik, a nice and smart guy who nonetheless became best known for refusing to acquire a Texas driver's license. Badnarik finished with just 0.32 percent of the vote, one of the worst performances among the generally desultory performances of LP candidates.
This isn't to say Johnson is all things to all libertarians (broadly defined as believers in fiscal responsibility and social tolerance). He's said some odd things on the campaign trail, most notably about U.S. military support for capturing Joseph Kony, the leader of the Ugandan cult, the Lord's Resistance Army. In a Daily Caller interview earlier this year, Johnson unconvincingly called the LRA "possibly the worst terrorist group that's been on the planet for the last 20 years." Um, no. It took Johnson a while to find his voice in explaining what he calls the "fair tax," or a consumption-based tax that would replace all existing personal and business income taxes. I personally find the widely circulated video of him crowd-surfing to be one of the greatest moments of the 2012 campaign (right up there with Clint Eastwood's Empty Chair improv), but I understand why latter-day Hobbesians find it unsettling to see a potential ruler literally put his life in the hands of the rabble.
But geez-louise, this guy Gary Johnson is everything any party could hope for in a presidential candidate: He's accomplished in private and public life, he's vibrant and energetic, and especially since kicking free of the final parts of his Republicanoid past like a butterfly leaving the cocoon for good, he's genuinely charismatic when stumping on the differences between his own views and those of Obama and Romney. A few weeks back, I saw him bring about 500 people to their feet at a University of Cincinnati rally by forcefully detailing the ways in which he and he alone is talking about government spending and debt, ruinous foreign policy, and federal buttinskys dead-set on policing the boardroom and the bedroom. He's the best of both worlds: A leader who can move an audience but who always stresses that you and your choices - as opposed to some nutty coercive agenda - come first. He's the perfect candidate for a post-best-and-the-brightest DIY world. We don't need a maximum leader, we need someone who will set and enforce simple rules for a complex world.
So if you vote and think your vote should express your political beliefs, there's nowhere else for libertarians (and Libertarians) to look.
But of course, Gary Johnson is not going to win the election. Indeed, if past is prologue, he will likely finish with less than 1 percent of all votes cast. So the real case for Gary Johnson - a tougher case to make - is arguing for why you should think about pulling the lever, tapping the screen, or punching the butterfly ballot for the guy knowing that he's a bigger lost cause than the Chicago Cubs winning the World Series, the Gilmore Girls movie getting made, and the release of Dr. Dre's Detox put together.
As it happens, Johnson has addressed this very question in his forthright manner. "A wasted vote," he says, "is a vote for someone you don't believe in." He's even exhorting people to "waste" their vote, telling an audience at New York University, "We can make a difference in this election. Waste your vote!” How will pushing Johnson's total above the 1 percent mark - and ideally, higher than the spread of votes separating Obama and Romney on November 7 - make a difference?