Not exactly jokes but
Reader, suppose you were an idiot; and suppose you were a member of Congress; but I repeat myself.
Mark Twain (1835-1910), American writer, on Congress
God damn your god damned old hellfired god damned soul to hell god damn you and god damn your god damned family's god damned hellfired god damned soul to hell and good damnation god damn them and god damn your god damned friends to hell.
Peter Muggins, American citizen, letter to President Abraham Lincoln (1809-65)
Filthy Story-Teller, Despot, Liar, Thief, Braggart, Buffoon, Usurper, Monster, Ignoramus Abe, Old Scoundrel, Perjurer, Robher, Swindler, Tyrant, Field-Butcher, Land-Pirate.
Harper's Weekly on Abraham Lincoln
He slept more than any other president, whether by day or night. Nero fiddled, but Coolidge only snored.
H. L. Mencken (1880-1956) on Calvin Coolidge (1872-1933)
A crafty and lecherous old hypocrite whose very statue seems to gloat on the wenches as they walk the States House yard.
William Cobbett (1763-1835), on Benjamin Franklin (1706-90), American statesman and scientist
The moral character of Jefferson was repulsive. Continually puling about liberty, equality, and the degrading curse of slavery, he brought his own children to the hammer, and made money of his debaucheries.
Alexander Hamilton (1757-1804), American politician, on Thomas Jefferson (1743-1826), 3rd American president
The people are tired of a man who has not an idea above a horse or a cigar.
Joseph Brown on Ulysses S. Grant, 18th American president
As an intellectual he bestowed upon the games of golf and bridge all the enthusiasm and perseverance that he withheld from books and ideas.
Emmet Hughes, American writer, on Dwight Eisenhower (1890-1969), 34th American president
Garfield has shown that he is not possessed of the backbone of an angleworm.
Ulysses S. Grant (1822-85), 18th American president, on James A. Garfield (1831-81), 20th American president
Like rotten mackerel by moonlight, he shines and stinks.
John Randolph, American politician, on Edward Livingstone (1764-1836), American politician
He would kill his own mother just so that he could use her skin to make a drum to beat his own praises.
Margot Asquith (1864-1945), writer and wife of Prime Minister Herbert Henry Asquith, on Winston Churchill (1874-1965)
He couldn't see a belt without hitting below it.
Margot Asquith (1864-1945) on David Lloyd George (1863-1945), British prime minister
He has all the characteristics of a dog except loyalty.
Sam Houston, American politician, on Thomas Jefferson Green (1801-63), American politician
He has committed every crime that does not require courage.
Benjamin Disraeli on Daniel O'Connell (1775-1847), Irish lawyer, politician and agitator
Stupid asses.
Karl Marx (1818-83) to Friedrich Engels (1820-95), private correspondence, on the proletariat
http://www.insults.net/html/historical/political_insults_5.html