Obama was actually beating Clinton. How can someone be the people choice and basically be mathematically eliminated?
Ted Kennedy took his fight all the way to the convention and weakened Jimmy Carter even more on his re-election bid.
The difference between Clinton Obama and Clinton Sanders is Clinton back then was fighting for her own ambitions. Sanders is fighting for shyt his supporters actually want. People really believe in his cause and the longer he stays in this the more likely it is if he actually loses his supporters won't back Clinton and she'll lose a decent chunk of people she needs to get elected in the general election.
I firmly believe Clinton will lose in the general even to Trump.