What's the Catch?

The Devil tells a politician, "Look, I can make you richer, more famous, and more successful than any politician alive. In fact, I can make you the greatest politician that ever lived."

"Well," says the politician, "what do I have to do in return?"

The Devil smiles, "Well, of course you have to give me your soul," he says, "but you also have to give me the souls of your children, the souls of your children's children and, as a matter of fact, you have to give me the souls of all your descendants throughout eternity."

"Wait a minute," the politician says cautiously, "What's the catch?"