Here was the picture. So, it doesn't have any cite to check it. But I strongly suspect it is misleading, maybe because of one of these two reasons:
1) The first 35 states in 2008 were not the same states as the first 35 states in 2016. So it seems possible that more total pledged delegates have been allocated, and therefore even if Bernie has more than Obama had, that represents a smaller fraction of the total.
2) If you remember, I think both Florida and some other state had all their delegates stripped away because they held their primary too early in the process. So Obama's total delegates would really only have been from 33 states, not 35.
If you think about it, this picture has to be misleading. At this point in 2008, Obama had a significant lead over Hillary in pledged delegates. In 2016, Hillary has a significant lead over Bernie. How can the statistic in the picture be reconciled with that fact?