The Obama Chimp??

Okay so we all know the story.
Blah blah blah...but here's how the Post is defending itself

"The cartoon is a clear parody of a current news event, to wit the shooting of a violent chimpanzee in Connecticut. It broadly mocks Washington's efforts to revive the economy. Again, Al Sharpton reveals himself as nothing more than a publicity opportunist."
1) There was an article about a Chimp shooting.
2) Obama approved the stimulus package.
3) Obama signed off on it...he didn't write it.
4) My question is why was the quote placed on the picture? What do the two events have in common?