It is fitting that presidents give farewell messages. But given the venue and setting President Obama had chosen, it was fairly easy to surmise that this would be a final political rally and national lecture. I will simply recount the one lasting legacy of Barack Obama that will always be emblazoned in my memory. When I think of him, I will think of this. When I reflect on his promised era of hope and change, I will be drawn to this image. Despite your personal feelings on his coolness, his character, his charisma, or his competence, Barack Obama will forever...