Papa John's uses YouGov BrandIndex to track public perception. The most interesting thing about this article was the owner of Papa John's response. It is a perfect example of how numbers can be interpreted in many different ways. YouGov reported that perception was more negative for Papa John's after "Obamacare sur-charge" comments, while Papa Johns responded that perception was actually up, when calculating all factors.
It is also a good example of a company that is used to do brand research and track public opinion for brands. It shows how companies are constantly tracking polls, not just snap shots in time, but over time as well.
This article also illustrates the argument between correlation and causation. Did the Affordable Care Act comments really cause negative perception of Papa Johns, or did it just happen at the same time?