Ran into this site, SpendConsciously ,while trolling the Internet. If you are teaching (or learning) about interest group politics this site has a REALLY fun and interesting App. It is called "BuyPartisan". I downloaded on my Smartphone for "free".
Using your phone you can scan the bar code on a product, and if they have the company in their database, it will return to you the proportion of dollars this company donates to the major political parties (and "others").
Spent some time doing this to items in my pantry.
I think it might slow down my shopping trips as I use this in stores. Knowledge is power, or so I have heard.