Remaining goals for this piece:
1) animated transitions between years
2) line or bar chart below which will show a time series of the budget item selected by the user by clicking on the sankey
3) adjust discretionary/mandatory arrangement so the net interest link doesnt overlap
a visualization by MasonChinkin, posted together as a #d3js learning exercise on night after a d3 meetup
see the example in webpage form as well at
https://masonchinkin.github.io/us-budget-sankey.html#portfolio