Again I ask: who are you talking about? Just because someone supports a candidate does not mean that they support all of what that candidate believes. Frequently, they even oppose those stances, and actively work to change them. Not everyone is a partisan.
If you're going to support the candidate no matter what, why should the candidate care what your opinions are? They have your vote already. Candidates will only care about your opinion on surveillance if you're willing to deny them your vote over the issue.
I suspect that it is this (somewhat cynical) line of thinking that cost Hillary the election. Successful politics is about coalition building. Maintaining and expanding those coalitions means following through on those promises.
Or she didn't realize that what had worked for Obama, who's often cross that he even had to deal with the Congress, even when it was Democratic, and very famously went for a narrow but very deep Get Out The Vote (GOTV) strategy, wouldn't necessarily work for her.