Kingmaker candidate? What if this were to happen?

[Simfan34]

Some wealthy independent specifically targets a number of small non-swing states, running a low tech, ideologically amorphous campaign that manages to be dismissed as inconsequential by the two parties. Lots of diner meetings, house parties, New Hampshire style stuff except a year long. Come election day, however, the two parties are neck and neck 259-255 and the guy has won a number of states with small pluralities, and has the balance, 24.

How much can he get out of it? What happens?