From Wikipedia: The caning of Charles Sumner, or the Brooks–Sumner Affair, occurred on May 22, 1856, in the United States Senate chamber, when Representative Preston Brooks, a pro-slavery Democrat from South Carolina, used a walking cane to attack Senator Charles Sumner, an abolitionist Republican from Massachusetts. The attack was in retaliation for an invective-laden speech given by Sumner two days earlier in which he fiercely criticized slaveholders, including pro-slavery South Carolina Senator Andrew Butler, a relative of Brooks. The beating nearly killed Sumner and contributed significantly to the country's polarization over the issue of slavery. It has been considered symbolic of the "breakdown of reasoned discourse"
Another excellent entry.
(Good luck with everything going forward.)