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I'm not fololwing, what's connecting Obama's behavior to Warren's and Sanders's?

They are assuming left leaning Presidents will do the right thing. It's, at best, a little naive.

You mean the left thing

They are Democrats (the political party espouses civil rights).

Obama is your counterexample here.

There is a wide variety of opinion on this within the party, such that party affiliation does not reveal any preference.