“The Fringe Frontrunner”

That's what Ryan Lizza is calling Herman Cain:

In previous elections, these fringe candidates have never come close to becoming serious contenders. They run to push the ideological debate further to the right or left and to make a name for themselves in the process. If they are lucky, they end up with some notoriety, a new national fundraising base, and perhaps a show on cable TV. These types of fringe candidates don’t truly prepare for the absurdities and difficulties of a Presidential campaign because in their heart of hearts they never believed they would make it very far.

Herman Cain has made it, and the result is akin to a dog catching a car.