US President Barack Obama has begun an overhaul of his inner circle, lending the White House a more business-friendly face with the appointment of an outsider banker, William Daley, as his chief of staff. Daley continues the heavy Chicago bent of Obama's White House. He is a son of the legendary Chicago mayor Richard Daley and brother of the city's outgoing mayor, also named Richard. But he marks a departure for the president after two years in office by dint of his considerable Wall Street experience. The new chief of staff has for the past seven years been a senior executive at JP Morgan Chase, and before that worked for a hedge fund and in telecoms. He straddles the business-politics divide, having been Bill Clinton's commerce secretary for three years from 1997 and managed Al Gore's failed run for the presidency in 2000. Daley's appointment was seen as a signal of Obama's intention to change political tack after receiving a drubbing in the midterm elections in November. The president now faces a resurgent Republican party which on Wednesday took control of the House of Representatives. Daly, who brings with him an outsider's perspective and minimal ideological baggage, may help Obama to bridge the party divide more successfully than he has to date.