A proposed ammendment to CISPA would give the Secretary of the Department of Homeland Security--in this case, Janet Napolitano, the authorization to "intercept" a large protion of the web and emails, and then "deploy countermeasures" against those deemed to be a threat on the internet. Rep. Sheila Jackson Lee is spearheading this initiative, which would give Napolitano broad authority to monitor all government networks. The definition of "government networks" is so broad that it would include government contractors and university networks, as well as possibly WiFi networks run by federal agencies in government-provided housing.
What seems to be bothering people so much about this (beyond the fact that it's CISPA) is that the ammendment explicitly states that Napolitano would be authorized to take action, "notwithstanding any other provision of law".
Read more about it here: http://news.cnet.com/8301-31921_3-57420580-281/cispa-revision-allows-dhs-internet-countermeasures/