Has a presidential election ever been as negative as this one? (Elaine Kamarck, Brookings)

Many Americans think the bloodbath between Trump and Clinton is unprecedented in American history, but the reality is that short term memories and a sugarcoating of our nation’s presidential history mask some contentious races for the White House.

https://www.brookings.edu/blog/fixgov/2016/10/18/the-most-negative-campaign/