The Duke puts his wallet where his mouth is. He first challenges his supporters to raise $100,00 by midnight (last night) and if they do, he will put up $500,000 of his own money. But don't bother with this first video. Watch the second one instead.
In this one (if I've got it right) he makes three promises. First, he's going to put $500,000 of his own money into his own pot anyway, despite only $20,000 being raised in two hours. Second, if supporters manage to raise $500,000 for his campaign in the month of April, then he will put another $500,000 of his own money into the pot. Third, if supporters do raise $500,000 in April, as well as putting in the extra $500 grand himself, he will also match dollar-for-dollar the total to be raised in a money bomb scheduled for May 1st, whatever this total is.
Never underestimate The Duke's own self-confidence in himself. If you could eat self-confidence, then Peter Schiff would be the finest Wild Iranian Ossetra Caviar, in the world.
Move straight to the second YouTube. The first is just here for completeness: