Dave Weigel asked Peter Singer about that and here is his reply
It’s absurd. Cass Sunstein has developed his own views on this issue. You might as well say that Glenn Beck is a disciple of Lyndon LaRouche because they agree on opposing the public health care option. (Incidentally, Glenn Beck’s characterization of my views in that clip is also a grotesque distortion.)Weigel says that he also spoke to David Martosko (the fake consumer advocate) and will have more on this subject later.
My “work” with Cass Sunstein on these issues consists, in its entirely, in my attending a one-day workshop at the University of Chicago some years ago on a proposal to label animal products so that consumers could know more about how the animals were treated. If I recall correctly, the workshop was co-hosted by Sunstein and Martha Nussbaum.
He also once reprinted an essay of mine in a book that he co-edited with Nussbaum.