It states that:
Corporations are not persons with constitutional rights equal to real people.
Corporations are subject to regulation by the people.
Corporations may not make campaign contributions.
Congress and states have the power to regulate campaign finances.
The announcement I found it in was here:
http://www.huffingtonpost.com/rep-bernie-sanders/saving-our-democracy_b_1137783.html With a petition of support here:
http://sanders.senate.gov/savingdemocracy