Most folks miss the obvious, even if it gives immunity as alleged (which I don't see as immunity, but as defined in the bill, statutory defenses which must be established by "substantial evidence provided to the court",) the key thing is the time span covered in provision 802.
‘(A) in connection with an intelligence activity involving communications that was--
‘(i) authorized by the President during the period beginning on September 11, 2001, and ending on January 17, 2007; and
The illegal monitoring began BEFORE September 11, 2001, shortly after GWB took office.
http://www.democraticunderground.com/discu... 
