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Krystal Ball said a short while ago on the Martin Bashir program that she has started a BoycottRush.org website and petition for people to sign that is directed at those companies that advertize on his program to stop supporting him. Due to heavy traffic you can't get in at the moment, but the list includes the following companies:
I'll get a better link later.
PS -- This list has expanded with several removed. See the link a few posts below.