I think there are one too many dimensions to this data. I know they collect statistics on both approval and disapproval, but for the most part approval + disapproval = constant, so I think it would be more informative to simply plot something like (approval - disapproval) on the y-axis and time on the x-axis. Then you could see the trends and compare different presidents without having to watch the animation once for…
Actually, for several of the presidents, approval + disapproval != constant. For example, Obama moves straight right (up on disapproval) for his first 200 days before descending in approval. There seems to be a substantial difference between the effects of actions that anger some (presumably of the opposing party) and those that disappoint all.
http://eagereyes.org/blog/2012/embracing-uncertainty-two-lin...