Editorial cartoonists Breen, Wilkinson and Luckovich are interviewed by Michael Cavna in "Line by Punch Line," Washington Post Sunday, August 3, 2008; M06
Further information can be seen at "Cartooning the Candidates," a video in which "Editorial cartoonist Steve Breen describes his method of sketching Sen. Barack Obama and Sen. John McCain. Video by Liz Kelly."
The Art of Political Caricature slide show.
In the same section of the paper, Nick Galifianakis drew himself and his ex-wife Carolyn Hax in her advice column. It's a meta-commentary since the drawing is about how ex's can stay friends, which the two of them have done.