I just learned of US politicians roasting each other. All of the following video links are from youtube.
I personally feel that link #3 may be the best roast of all.
Roast (comedy) - Wikipedia, the free encyclopedia
A roast is an event, almost exclusively in the United States, in which an individual is subjected to a public presentation of comedic insults, praise, outlandish true and untrue stories, and heartwarming tributes, the implication being that the roastee is able to take the jokes in good humor and not as serious criticism or insult, and therefore, show their good nature.
Perhaps non-American forum members, would not really understand link #1 and #2.
This first link shows Obama roasting Donald Trump.
President Obama Roasts Donald Trump At White House Correspondents' Dinner! - YouTube
This link shows Mitt Romney roasting Obama. It actually made me laugh.
Mitt Romney Roasts Obama, Media at Annual Al Smith Dinner 'So Little Time,So Much to Redistribute' - YouTube
This link shows Wanda Sykes roasting Obama and republicans.
Wanda Sykes at the 2009 White House Correspondents' Dinner - YouTube
I found this to be a great piece of stand up comedy. In the beginning she roasts Obama. In time 11:40 - 13:00 she roasts Rush Limbaugh.
This link shows Jimmy Kimmel roasting US politicians, and the media.
Jimmy Kimmel Hosts the 2012 White House Correspondents' Dinner - YouTube
I liked what he said 23:00 - 23:30 about the US media.
This link shows Seth Meyers roasting Obama, and republicans.
Seth Meyers correspondents dinner 2011 - YouTube
Here are a few others,
Obama Roasts Romney at Alfred E. Smith Dinner - October 18, 2012 - YouTube
Jay Leno at White House Correspondents' Dinner - YouTube
Steve Bridges as President George W. Bush at WHCA Dinner 2006 - YouTube
Colbert Roasts Bush - 2006 White House Correspondents' Dinner - YouTube