What % of Libertarian Support Comes From Former Democratic Voters?

[Kitteh]

I think the vast majority of Libertarians are people who wouldn't vote or would vote for indies or some other third party otherwise. I'd guess that maybe 25% would vote GOP otherwise, 15% Dem, 60% other/no vote.

[Kitteh]

Younger libertarians are probably left leaning, older libertarians probably right leaning

Depends on what you mean by "older". For most of the 1970s the left-leaning wing of the party was actually more dominant (many people described the libertarian platform then as "low-tax liberalism"). It was really during the 80s that the Paulite/paleoconservative wing took over. Johnson was in many ways a return to the party's roots.