Sept. 22 (Bloomberg) — Dan Gerstein, strategist at Dan Gerstein Consulting, talks with Bloomberg’s Melissa Long about the potential impact of White House staff changes on the policies of the Obama administration. Rahm Emanuel, President Barack Obama’s chief of staff, is likely to leave the White House before the November congressional elections to run for mayor of Chicago, people familiar with the matter said. The White House announced yesterday that Larry Summers, director of the National Economic Council, will return to Harvard University by the end of the year. (Source: Bloomberg)