AWWW, someone got to I Love You Forever before I could. :D
For whatever odd reason, I liked the Dr. Seuss book "Marvin K. Mooney, Will You Please Go Now!" Turns out that "Marvin" was supposed to be Nixon. The book and his presidency ended the same way.
As for modern-day children's books, there's a crazy one I like called "Don't Let the Pigeon Drive the Bus" by Mo Williems. This is the guy who did the cartoon Sheep in the Big City, if you remember it. He does a bunch of books with the pigeon. There's one where the pigeon and another bird argue over a hot dog they find on the ground.