Nigel Farage is already one of the most influential politicians of this century, and he's never been elected as an MP.
Through UKIP, he maneuvered the tories into holding a referendum on the EU. Look how that turned out. And he did it without needing to win lots of seats. He's not stupid, and he knows how to wield influence.
I hate the man, but I think we underestimate him at our peril.