2nd hat tip in ten minutes to Tom Watson (if I do another one it will be a hat-tip-trick).
I have occasionally tried to find comparisons of the popularity ratings of current and past US presidents. Unfortunately, the information is often in several different places, making comparison difficult. Hats off, therefore, to the Wall Street Journal, who display an excellent graphic on the subject. It is remarkably clear and has a bar on the left to click for detail on each President.
The two Presidents which stand out the most are Eisenhower, who seems to have been the most consistently popular of the post-war Presidents, and Clinton, who is the only one who was more popular when he left office than when he entered it.