Gregory Mankiw, a top economic adviser to President George W. Bush who stirred controversy with his comment that outsourcing US jobs might benefit the economy, has resigned, the White House said on Wednesday. Government sources said Federal Reserve Governor Ben Bernanke was a leading candidate to replace Mankiw as chairman of the White House Council of Economic Advisers. White House spokesman Scott McClellan declined to comment on Mankiw's replacement but said someone would be named soon.