==Actually, you're wrong== 
 At that time, Obama had South Carolina. You do not rely on one recent poll in determining who is in the lead. That is just stupid. If heavy amounts of polling are coming in, you rely on the latest 5 or 4... or if a poll is coming out only once a week or every two weeks, you rely on the whole month's... So at the time, yes, Obama had South Carolina.   

 In light of new polls I put up today, Hillary is in fact now holding South Carolina. 

 Using only one most recent poll is pure ignorance.. to put it in your own words, "that one poll could be a one time thing." Which is why we use more than one poll.