This is the final day of the presidency of Barack Obama, the finest president of my lifetime. I have no adequate words to express just how dignified this president has been in the face of, let's just say, opposition. He has managed to keep his empathy and humor through it all, which I think is evidence of his fierce intelligence, bedrock goodness, and ability to take the long view. Plus, let's just face it, the man is cooler than just about anybody else on the planet. I think I'll just mark this day with photographs of our president with children over the course of the past eight years, because he has been a powerful role model for young people of all backgrounds. Look at the joy. Children know.