There's a simple reason you can and must vote Third Party whenever the choice is available. It doesn't require a lot of explanation or understanding, and it's simply this.
When a main party candidate rises to the financial and authority level necessary to actually run for office, let alone president, he has competed against thousands of potential candidates, and he has won the advantage, won the nomination. They win for a simple reason: Support, and more support. This costs money. By the time someone rises so high in a main party, you can believe he has been thoroughly bought and paid for by special interests. Bush was Oil, Obama is the Banks, the Housing Industry, ACORN. You cannot continue to vote for individuals whose campaign contributions prove that their loyalties have no more room for the American people. To me, main party is out of the question. Get an accidental president, and give America the fantasy it enjoyed with Theodore Roosevelt, who was never intended to be president and whom no one saw coming. All we need is to elect a Third Party candidate once, and show America that it can be done, and the corruption of the monopoly and trust on political power shall be undone.
Vote for the candidate with the least advertising, the least good press, and in fact you can believe at this point, that bad press is a sign of the pressed individual being a threat to Liberal hegemony. Why not vote for the demonised, the underexposed, and those who run with money out of their own pockets? You know who owns the media; defy it and its monopoly on your opinions and the ads you view.