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From Declan McCullagh's article in CNET:
A fourth amendment, also from Jackson Lee, would extend CISPA [3] by allowing Homeland Security to "intercept" and "use" data that transits federally-controlled networks. The Competitive Enterprise Institute [4], a libertarian-leaning think tank, told CNET that this proposal could allow the department to monitor the communications of the federal courts and Congress and intercept tax returns sent to the IRS.
Links:
[1] http://cei.org/other/cei-staff
[2] http://news.cnet.com/8301-31921_3-57420610-281/proposed-cispa-amendments-do-little-to-appease-critics/
[3] http://news.cnet.com/8301-31921_3-57420580-281/cispa-revision-allows-dhs-internet-countermeasures/
[4] http://www.cei.org/