[img]http://d.yimg.com/a/p/ap/20100422/capt.3b79fbfd9a1643b4876a2411515d9445-3b79fbfd9a1643b4876a2411515d9445-0.jpg?x=130&y=83&q=85&sig=ETbcVGm7tpwMmpcLKACUGg--[/img]AP - President Barack Obama rebuked Wall Street for risky practices Thursday even as he sought its leaders' help for "updated, commonsense" banking regulations to head off any new financial crisis.