The populist badge is given when you have an answer that outscores an accepted answer with a score of 10 by more than 2x.
This creates a few perverse situations. If there is an accepted answer with a score of 9 and someone else has an answer with a score of 99, they don't get the badge. But if someone votes up the accepted answer then they do.
I suggest that populist should be like this
When your answer outscores an accepted answer by more than 2x and your score is at least 20.
It keeps to the original spirit of the badge, while avoiding the situation given above.