So if I had a team of interns working for me, here's something I would have them do.
1. Quantify the relative value of each elected, partisan office in the country. Maybe the President is 10000, a Senator is 50, a Congressperson is 10, a Governor is 200, a state senator might be 2 a state legislator 1 etc...
2. Count up the values each party has currently.
3. Repeat this for every year in US History (adjusting for changing numbers of offices).
4. Plot that out.
But I don't. And it's kind of a Hurculean task.
