The left writes its own rules about who gets to say what and how they say it.
Previously, we were treated to leftists calling for Pres. Bush to be killed to save the world.
The left is now worried about a few McCain supporters, but show no concern how leftists print vile things on tees and proudly wear them in public.
see:
http://gatewaypundit.blogspot.com/2008/10/angry-left-protest-cnt-sarah-palin-in.html
bttt
http://michellemalkin.com/2008/10/12/crush-the-obamedia-narrative-look-whos-gripped-by-insane-rage/