As El Rushbo has often said, "The issues that decide elections often do not come up until the last months of the campaign," owing both to the fact that memory is short and life is long, and that leftist mass media is very good at obfuscation/distraction from the most substantive issues.
That being said, I think this is one of those incidents where regardless of whether the regime is responsible or not, they will get most of the blame from voters (even non-conservative voters), regardless of what the 'Crats say going forward.
Largely and increasingly, the 'Crats dogma is being run over by its karma.