There is a staggering amount of money up for grabs in two national lotteries: $2.2 billion and counting. The Mega Millions jackpot is up to $1.6 billion, the largest in U.S. history. The drawing is Tuesday night. The Powerball top prize has climbed to $620 million. That drawing takes place on Wednesday. Lines to buy tickets are stretching out the doors of some retailers. Gordon Medenica is the head of Mega Millions and says 95 percent of tickets purchased are computer-generated quick picks.