(and if you listened closely to what Ron Paul said, he doesn't have much hope for the libertarians winning-he said he hopes they are able to do some good)
Except for the interview with George Step... Paul never gave himself much of a chance to win in the dozens of interviews when he was asked why he was running or even in many interviews that he wasn't even asked that specific question.
Winning is everything in politics, if you don't win you don't have power in government, but the Barr campaign can go along way to get the LP qualified automatically in many states for the next four years. I've haven't been much of a fan of the national LP but if Barr can bring attention to issues, get in the debates and get some votes he can help local LP candidates and help to build a legit 3rd party.