A while back, I made a graph overlaying the senate party majority with the national debt. While correlation isn't sufficient for causation, I did learn a lot about the shape of the national debt as well as assertions between political party and national debt is not as clear cut as political commenters and pundits would like you to believe.
However, the entire experience of producing the graphs in those blog post left me dumbfounded with how tedious it was just to see the shape of the data.
As a programmer, I can figure out how to find and graph the data, however painfully. But it's completely inaccessible to regular everyday person that uses the internet. There's a lot of pubic data out there, but people aren't able to access it easily. If it doesn't show up on google's search, that's where they stop.
This is why I'm working on Graphbug--making public data more easily accessible through visualizations. Some questions are best answered visually.