Gary Johnson already is winning.  He is trying to promote smaller government, lower taxes, free trade, less foreign intervention, a balanced budget, and across the board reductions in government regulations and expenses.
He has already gotten more media attention, and higher poll numbers, than any Libertarian Party candidate in history.       He is also very close to winning the next level, which is an invitiation to the presidential debates.  
Yes, the odds are stacked against any third party candidate.
It is like David fighting Goliath.
The more Gary Johnson wins, the more the American people win.
The more Clinton and Trump win, the worse for the American people.
Clinton or Trump both mean, more deficit spending, more government debt, bigger government, and more crony capitalism.  
If you trust Clinton or Trump, you are in the minority.
I will support Gary Johnson.

Vote for the person you believe in – that's how you get change
https://www.youtube.com/watch?v=98TSHB0up5w