Okay, it's just that I think the pun is perfect, okay?
You have no idea how long I've held off on posting this joke on the blog, out of deference to friends who genuinely admire Obama (or at least admire his speeches and choose to believe he actually means them). But it's just too good a pun and I can't stand it any more. So, having raised the caveat that I do not for a moment believe that Barack Obama and Osama bin Laden are in any way moral equivalents, and having stated clearly that I would object to the comparison if it were to be made in any way seriously, I give you:
Q. What is the difference between Obama and Osama?
A. It's the b/s.