Right after the Access Hollywood tape came out.
Yes. In that election, Clinton would see spikes like that whenever Trump did something especially stupid or controversial. But they never lasted long, the race remained pretty tight and fluctuated a lot. This is about the best she ever polled. Then of course she had her own “scandal” thanks to Comey that eroded her lead.
This election, on the other hand, has been remarkably steady, with Biden routinely cracking into the 50s and having double digit leads the whole time. Trump’s only led in like 1 Rasmussen poll in the past god knows how many months. It’s not comparable at all. Trump needed to turn something around desperately, instead if anything it’s just getting worse for him on the home stretch.