Perry's claim that the Social Security system is a "Ponzi scheme" was vigorously attacked by Romney. The long-term health of the Social Security system and of other entitlement programs is certainly an issue that will need to be seriously addressed in the years and decades to come. It will be interesting to see how this issue is dealt with in the actual presidential debates a year from now.
Maybe the most philosophically interesting thing from that debate was Ron Paul's argument that a person who willingly chooses to be without health insurance should be allowed to die if they get hurt and need care. It's a position that really should be discussed in a more reasoned way than it has been. Basically what he's saying (in a very extreme way to be sure) is that people have to make choices and be responsible for them rather than expecting government to save them from their mistakes. It's an idea that we need to debate -- do we really believe that in this country? To what extent?