How much responsibility should team Obama take for the course American politics has taken since they left centre-stage? HARDtalk’s 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. Valerie Jarrett is a close friend and adviser 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?