The nature of power is to hang on to it all costs. And that's what Republican and Democrat parties have done. The maze of rules and cost of getting on to the ballot in 50 different states is daunting to any potential third-party candidate for president - by design. And that is why, on the very rare occasion that someone has had the fortitude to take on the entrenched powers, they've usually had very deep pockets, like the billionaire Ross Perot, who was the last third-party candidate.