http://eagereyes.org/blog/2012/embracing-uncertainty-two-lin...
Note that we're looking at days 0 - 1,000, that is, less than a 3-year range. This completely overlooks the second term of 2-term presidents. So, for example, we're seeing GWB's post-9/11 boom but not his later ignominy, and we're not seeing Reagan after he got the economy sorted.
This reminds me in many ways of Hans Rosling's TED talk on visualizing global health outcomes and other data:
http://www.ted.com/talks/hans_rosling_shows_the_best_stats_y...
x-axis is time, y is approval/disapproval, width of line represents percent neutral. But then where's the excuse to play with the neat video library?
http://en.wikipedia.org/wiki/Historical_rankings_of_Presiden...
There might be a less confusing way to display the data.