Democrats making comments when the press isn't looking.

Sources:
Truman
http://community.seattletimes.nwsource.com/archive/?date=19911103&slug=1314805

Johnson
"Inside the White House" by Ronald Kessler

Clinton, Hillary
http://www.hillaryproject.com/index.php?/wiki/Hillarys_Foul_Mouth/

Clinton, Bill
http://emptysuit.wordpress.com/2010/08/02/the-clintons-jews-and-niggers-warning-graphic-language/

Wallace
(don't be silly)

Farrakhan
http://www.nytimes.com/1984/07/17/us/farrakhan-again-describes-hitler-as-a-very-great-man.html

Lincoln
(Fourth Lincoln-Douglas debate)
http://theoleseagull.com/2009/09/abraham-lincoln%E2%80%99s-black-inferiority-white-superiority-quote-from-fourth-lincoln-douglas-debate/