Johnson voters.. I would say 30%.. with LP diehards being 20% and indies/Republican leaning Paul voters being the other 50%.
There was a certain part of the non Obama supporting left that voted for GJ over mj legalization, drones, civil liberties, militarism and other issues. Plus he was pro choice and pro LGBT rights which made him palatable to the left in a way Bob Barr wasn't (for comparison)
Johnson was also more socially liberal than Paul, while sharing similar fp and civil liberties views.
They mainly backed him over left candidates Stein and Anderson because they viewed him as more viable (be the 5% thing) or he had ballot access in their state whereas Stein/Anderson did not (Georgia and Indiana are good examples of this).
In terms of actual Libertarian party id and activity.. I would say it's 65-35 between the majority right leaning libertarians (true believers, Paul type supporters focused on economic stuff mainly and the deficit) and left leaning libertarians (former dems, former greens etc. who may care more about foreign policy, drug legalization, civil liberties etc.)
Younger libertarians are probably left leaning, older libertarians probably right leaning
Johnson won around 1% of the vote this election. Obviously the majority of this support came from people who would support the Republicans otherwise. My question is how much of his support was former Dems? Was it 10% or more like 40%?