A lot of people will try to tell you any disagreement over CISA is just politics -- that's just not it at all. The Electronic Frontier Foundation has a very short article, or announcement really, with several links to more in depth info, the tech companies & associations that have come out against CISA etc.
"EFF Disappointed as CISA Passes Senate"
eff.org/deeplinks/2015/10/eff-disappointed-cisa-passes-senate
CISA passed the Senate today in a 74-21 vote. The bill is fundamentally flawed due to its broad immunity clauses, vague definitions, and aggressive spying authorities.
With security breaches like T-mobile, Target, and OPM becoming the norm, Congress knows it needs to do something about cybersecurity. It chose to do the wrong thing. EFF will continue to fight against the bill by urging the conference committee to incorporate pro-privacy language. And we will never stop fighting for lawmakers to either understand technology or understand when they need to listen to the people who do.