Obama needs to go to the grocery store. So does McCain.
Many people are clustered around the store in Obama's neighborhood. "We can't afford to buy what we need," they tell Obama. Obama understands what needs to be done. He pools part of their money and puts some of his in as well. Now those who are short on funds can use this collection of money to make up the difference.
Obama's wealth has increased recently. He can afford to give some of his money to those who need it. He can no longer buy everything in the store, but his family doesn't need the whole store. He gets his groceries and goes home. The people outside the store wave to him as he leaves.
McCain arrives at the grocery store in his neighborhood. Many people are clustered around it. "We can't afford to buy what we need," they tell him.
"I have my money, too bad for you." McCain buys everything in the store, leaving nothing for those outside. They shake their fists at him as he leaves. They follow him home. McCain cannot figure out why they are throwing rocks at his house.
A wise man finds a way to feed the needy. The greedy man only incites rage.