Scurrilous Copperhead pamphlet from 1864
If we think that our current political discourse has sunk to an all-time low, a look at the editorializing and pamphleteering by the Copperheads in the North against Abraham Lincoln during the Civil War might cause us to rethink.
From Wikipedia:
Wisconsin newspaper editor Marcus M. Pomeroy called Lincoln:"Fungus from the corrupt womb of bigotry and fanaticism" and a "worse tyrant and more inhuman butcher than has existed since the days of Nero... The man who votes for Lincoln now is a traitor and murderer... And if he is elected to misgovern for another four years, we trust some bold hand will pierce his heart with dagger point for the public good."
Weeks and Pomeroy didn't hold back, and neither was from the South.
What has been is what will be,
and what has been done is what will be done;
there is nothing new under the sun.
(Ecclesiastes 1:9)
H/T to The Writer's Almanac.