I have heard of the Electoral College and have made myself read up on and learn more about it, mostly because of this election. It's a scary proposition. It's not like the primary or even the conventions where each state gets up and says so many votes for this person and so many for that person.
The point remains that Gary Johnson will not, in all probability, gain enough votes in any state to win a sizeable enough number of Electoral Votes. Plus, a number of states are "Winner take all" on their Electoral Votes, so whoever gets the majority of votes, gets all the Electoral Votes for that state. Which is why a vote for Gary Johnson actually hands Obama Electoral votes, provided Obama is the highest vote "getter" in that state.