President Barack Obama will nominate Federal Reserve vice chair Janet Yellen to succeed Ben Bernanke as chairman of the nation’s central bank, the White House said Tuesday. Yellen would be the first woman to head the powerful Fed, taking over at a pivotal time for the economy and the banking industry. … Yellen emerged as the leading candidate after Lawrence Summers, a former Treasury secretary whom Obama was thought to favor, withdrew from consideration last month in the face of rising opposition. Yellen, 67, would likely continue steering Fed policy in the same direction as Bernanke. A close ally of...