Why is Barack Obama above mockery?

Trooper York had a post about the over reaction to this Rodeo Clown...

Banned for Life from the Rodeo for mocking President Obama?

Oh wait this is about saying who wants to see the President run down by a bull?  Well that would only go to the announcer not the rodeo clown.  And I mean, no one ever wished anything threatening (in a mocking way) to President George W. Bush did they?  Nah.  I mean wishing President George W. Bush would die a week ago is ancient history!

But because everyone has to be politically correct, the rodeo organizers and some lame Republicans are falling over themselves to toss this rodeo clown and the announcer under the bus bull to show how they can't be perceived as raaaaacist.  This is the flip side of speaking in metaphor, which is over reaction to things done if the person is conservative and ignoring them (or minimizing them) if they done by someone on the left.  Because it is not like you can mock President Barack Obama because of his shitty policies can you?

Here is a post from The Macho Response about racism.  So if we are post racial (which of course we are not) why can't we mock those we disagree with?

Update:
Twitchy/Dana Loesch and Instapundit have this too.  And this commentator is right, Barack Obama could never be mistaken for a Rodeo Clown...
TOM:  The President was there to shovel up some fresh policy!
Mandatory Clown Sensitivity Training!
11 Liberal Rule of Racism
Michelle Malkin: 10 images of Bush far worse than any rodeo clown...

Let's go down memory lane on mockery of President George W. Bush (I could literally find thousands of examples and they greatly outnumber negative images of President Barack Obama)...

Clown imagery

Because President Obama does not have any close corporate crony friends, does he?  

Funny mask imagery

Monkey imagery

Hitler imagery

Vampire imagery

I though the left was into vampires?

Eating kitten imagery

Eating pussy is bad? He is not black!