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But few, eight years ago, expected him to be followed into the White House by someone who is in every respect his opposite.
You could argue President Obama has no legacy, the achievements of eight years already lie shredded by the election of Donald Trump.
But we canβt really judge Mr Obamaβs legacy until we know how profoundly it will be undone.
This will be important.
Because this is about character, charisma and storytelling.
What were seen as positive qualities, a relief and a reaction after George W Bush, looked less favourable to some as time went on.