You can be a fan of any candidate you choose, but please don't be disingenuous.
Sanders leads Clinton in pledged delegates (36 v 32). Superdelegates are meaningless at this point; they will shift to whomever is winning by the time the convention comes around. For example, Bill Clinton changed his superdelegate vote from his own wife to Obama in 2008.
As for your percentages, currently 538 puts Sanders only 20% (not 30%) behind in SC, 24% (not 40%) behind in Florida, and tied (with a slight advantage) in Nevada. Additionally, the 538 polls have consistently underestimated Sanders for the two primaries we've seen so far due to the large turnout from younger voters. [1]
Hillary is the heir apparent, while Bernie is a relative unknown. Both are great positions to be in. She has nowhere to go but down, and he has nowhere to go but up. Polling is in Hillary's favor, but momentum is in Bernie's. There's no way of knowing who will win at this point.
You may support whomever you choose, but please try to remain truthful.
[1] http://projects.fivethirtyeight.com/election-2016/primary-fo...