The Democrats should have challenged the design of the ballot BEFORE the election. I guess nobody realized how bad it would be beforehand.
The Democrats (specifically Theresa LaPore, the head) in the Palm Beach county elections board designed the butterfly ballot themselves and had used it in many prior years in the Palm Beach area. I am sure this ballot had the same consequences in other elections as well. It was not a new type of ballot design.
The truth is that the Democrats were not smart enough to challenge the ballot they had created in advance. It was a case of being too smart for your own good.