As Joan McCarter diaried this week, the Senate's version of CISPA (S 3414, aka the Lieberman-Collins bill) has been granted cloture & will move to the amendment process on the Senate floor next week.
Among the interesting amendments is one that Chuck Schumer is proposing to add — & which several "prime movers" for S 3414 itself, including Diane Feinstein, support — namely, SA 2575, a gun-control amendment to ban high-capacity ammo magazines.
Several of the DLC sponsors of Lieberman-Collins, then, see the Schumer amendment as "icing on the cake" — support which likely gives it a good chance of making it into the bill — though, of course, if/when it does, then the entire bill will run afoul of those Republicans & Conservadems who would consider the amendment a "poison pill".
Big picture: No matter how "watered down" this bill is from its original language, remember that whatever comes out of this process will be conferenced with CISPA, an unmitigated disaster of a bill that will kill the Internet. Whatever your views on gun control, if a gun-control amendment can invoke the wrath of the Senate's bipartisan NRA faction enough to get us closer to the 51 votes needed to kill this bill, then I'm all for it.