The problems listed below are pretty exact: huge data sets, lots of cleaning and normalizing, and the snail mail/cd problem is real. Additionally, I'd note that ~40% of the states [somehow] charge for the data...it takes six digits to get a snapshot of all 50 states - and certain states (looking at you FL) say that they do not store the historical, meaning you have to connect with the local BoE's to aggregate the data.
A part of me [now] wants to open source this because of the DNC's actions.