Presidential humor?

I read today that the left is wishing death to a member of the media that dares question the Messiah, BHO. Of course, when the left wishes someone dead and the President laughs, it is just a joke, right? It isn't like Obama likes Limbaugh, right?

Then why isn't it just a joke when someone else jokes that, "Despite how the conflict has been portrayed by our glorious media, if you gave any U.S. soldier a gun with two bullets in it, and he found himself in an elevator with Nancy Pelosi, Harry Reid and Osama bin Laden, there's a good chance that Nancy Pelosi would get shot twice, and Harry Reid and bin Laden would be strangled to death."

CBS Sports distanced itself from Feherty's writing, saying it was "an unacceptable attempt at humor and is not in any way condoned, endorsed or approved" by the network. The PGA Tour also criticized him for an attempt at humor that "went over the line."

Why is that so serious, and requires an apology? Why isn't NBC attempting to distance itself from Sykes? Or is it only humor to wish death on people from the right?