A month into the new year, and the American economy is reeling from the ongoing banking crisis, battered retirement accounts, and mounting unemployment. Who are the folks who might make things better, or even worse? Who are the people who will move markets this year, up or down? To help you keep track of these “market movers,” U.S. News & World Report compiled a list of key CEOs, politicos, and even media stars to watch in 2009. So if things do improve, you’ll know whom to credit. And if they don’t, you’ll know whom to blame.