FISA Legislation Impasse

Most clear-thinking Americans want the Govt. to have the ability to intercept/monitor communications from those who plan us ill, so, in general, many of us don't understand the impasse in the House over the reauthorization of the Foreign Intelligence Surveillance Act (FISA). The President has threatened to veto the revised bill in the House that apparently does not sheild telecoms from suit when cooperating with the Govt. What is difficult is to obtain the actual details of the argument ("the devils in the details" in this case). Trying to read the actual bill is impossible. The so-called side-by-side summary of the House vs. Senate version (35 pages) is equally difficult, and the news media makes no attempt to actually analyze the fine points of this very arcane but critical legislation. Both sides in this debate are trying to whip up a frenzy from their supporters, but they provide little hard core information. Does anyone have any thoughts?