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Stephen Sackur speaks to Valerie Jarrett, former advisor to President Obama. It is one of the great puzzles of American politics; how voters could make history by putting Barack Obama in the White House - twice - and then elect Donald Trump as his successor. How much responsibility should team Obama take for the course American politics has taken since they left centre-stage? Valerie Jarrett is a close friend and advisor to Barack and Michelle Obama from early days in Chicago, all the way through the White House years. How will historians view the Obama legacy?