Gocha. Yeah, that’s hard to come back from when the number of people who basically hate you outnumbers those who will just tolerate you!
The strong disapprovers will voice criticism. Without strong approvers to defend against criticism, it will just wear down his approval base over time.
I don't think Obama has that many strong approvers left among white middle-class men, nor among married white women, which has GOT to hurt him in when the chat turns to politics in gatherings. Even radical Lefties will shut up when they find themselves vocally outnumbered.