what are all the advisor names?
karl rove, barry steven jackson, pete rouse, david axelrod, david plouffe, valerie jarrett, daniel pfeiffer
when did they take office?
january 21, 2001, september 1, 2007, january 20, 2009, january 20, 2009, january 10, 2011, january 20, 2009, january 25, 2013
and when did they leave?
august 31, 2007, january 19, 2009, october 1, 2010, january 10, 2011, january 25, 2013, present, present
now, which advisor was in office for at least 4 years?
karl rove