Mad TV, just like SNL, enjoyed using race as a basis for many of their jokes, such as in this spoof of Survivor where the teams are made up of 4 different types of Americans whose competitive abilities are determined by their race.
The skit makes fun of the idea that whites are superior to the other races, by having them be the only race shown in the video which does not seem to possess a weakness hindering their performance. It also points out how each race is given a different disadvantage, which is a metaphor for stereotypical disadvantages that each race experiences.
Here is the link to the video http://www.youtube.com/watch?v=EHOX-guaAhI&feature=related. For some reason i could not use the link here, and it would not let me embed it.