I don't want those that don't bother to vote now to start voting all of the sudden. They are almost by definition uneducated about the candidates and issues. Those people tend to vote for the guy that promises them the most freebies. Exactly the opposite of what we need.
As for Ron Paul and Gary Johnson, I agree they have great ideas and would have made presidents with views much more in line with the founders (although I think they would be such a shock to the current system I wonder if the republic could handle it all at once).
However, at this point there is really only two choices.. Obama or Romney. Although neither comes close to the libertarian ideals they are still drastically different on at least a few issues that should concern libertarians. Failing to vote for the one closest to your views has the effect of helping the one that is furthest from them.
What if you've only got about 5% in common with one and at the most 10% in common (based on his answers that week) with the other? Using your logic, I should vote Romney even though I wouldn't trust him to babysit a pile of dog because I think he might suck slightly less. I'm guessing if I said who I was voting for in other races many here would think I'm an idiot that is wasting votes. I am perfectly fine with that as I think supporting parties you don't agree with is extremely idiotic.