The reason Sanders distanced himself from Obama were different from the reasons congressional Democrats distanced themselves from Obama. You must understand this, if you understand American politics at all. Otherwise you shouldn't be on this board.
Maybe you can explain why someone who runs in a Democratic primary distances himself from the most popular Democrat in the country.
Bernie Sanders isn't Barack Obama.
He's not trying to be.
But, Hillary Clinton has tried to impress on voters that she would continue Obama policies.
It hasn't been working well for her [so far].