First of all, I haven't watched CBS in ages and as far as the boycott goes, Why would you want to boycott Home Depot. They are big supporters of our troops in Iraq and Afghanistan
but home depot may be receptive to just keeping their ads off of CBS/60min news.
They're just one of the names on the list. I would suggest sending a letter to all of the sponsors (or as many as you have time for). If they get enough public feedback, they may pressure CBS into getting its act together.
You and I may not watch CBS, but millions of ill-informed Americans do, and this is just a way we can make a difference.