[ahartman00]

I think "well before the personal computer showed up in the geological record" is a bit of hyperbole, but it is not a new phenomenon:

"We find that despite short-term fluctuations, partisanship or non-cooperation in the U.S. Congress has been increasing exponentially for over 60 years with no sign of abating or reversing"

"Partisanship has been attributed to a number of causes, including the stratifying wealth distribution of Americans [2]; boundary redistricting [3]; activist activity at primary elections [4]; changes in Congressional procedural rules [5]; political realignment in the American South [6]; the shift from electing moderate members to electing partisan members [7] movement by existing members towards ideological poles [8]; and an increasing political, pervasive media [9]."

https://journals.plos.org/plosone/article?id=10.1371/journal...

[intended]

Oh thank god, this is the report I was looking for, and I couldn’t remember what it was. Thank you.