46 last polls margin of romney and santorum vs obama

[Colbert]

first graph : each poll (46 polls for each candidate)

2e graph : average of 5 polls (1 to 5, 2 to 6, etc.)

3e graph : average of 10 polls (1 to 10, 2 to 11, etc.)

[Colbert]

source : http://en.wikipedia.org/wiki/Nationwide_opinion_polling_for_the_United_States_presidential_election,_2012