Technofreak:
It's well known that popularity as preferred PM is directly proportional to media exposure.
... this can go both ways. If the narrative is bad this obviously hurts popularity. Trump may not be a PM but the same rules apply - both Biden and Bernie polled more popular than him over the past year or so... pretty sure Trump had the highest media exposure lol.
More media exposure of Collins saying stupid things was just going to put National into the teens, although I'm not sure where National's hardcore base floor is.