National Total-Tax-Refund Lottery

New line item on federal income-tax returns: Number of $1 chances you'd like to buy to have all of your income taxes refunded. Bet 50 million people would buy at least a single chance. You'd keep drawing tickets till half the pot is awarded. Profit for feds: $25 million or more. Earmark for a worthy cause, like cancer research. Maybe have secondary prizes like a year's free postage. OK, we'd all get depressed if some billionaire won first, snarfing up the pool so no one else gets a dime. So maybe impose a top limit per winner, like $50,000.