Maybe he was doing this to show solidarity with all Muslims on the day before 9-11 and his approval of the mosque.
It is bizarre for that ring to be suddenly missing during his press conference,.
I have a message for the muzzies. I am with Michelle Malkin
http://michellemalkin.com/2010/09/11/911-remembrance-set-your-alarms-and-steel-your-resolve/