Named after the democratic New Hampshire Congressman, Richard "Dick" Swett, having a case of the Congressional is when you have a large amount of dick sweat. This mainly happens in the summer months to men and some transvestites.
Frank: Man, I have a wicked case of the congressional.
Jim: A lot of dick sweat, huh?
Frank: Feels like a full session of congress down there.
Jim: Swamp Ass is a bitch.