This one incident is not that newsworthy, but I think it's worth it to see how many core supporters stay with trump.
Obama's issue was that he was not liberal enough. That pissed off some and made others (like me) happy.
But at the end of the day his coalition held.
Trump had a diff dynamic at play. His coalition is based around disillusionment with the status quo and identity, backed up by go team estabslishment republicans.
His coalition is much more difficult to maintain (it's not as logical as we saw with health care) but his core is arguably more fanatical than obama's or at least more immune to ideological transgressions (they don't care if trump is not conservative enough as long as the identity horn keeps blowing).
All this say, given his coalition is bizarre and vote advantage is tiny, we should be keeping an eye on this aspect of his support.