It's honestly unclear. Lots of finger pointing going on right now and it's pretty murky.
Yes, their seems to have been a letter sent to Kenyon from 'someone' involved in the campaign. Without seeing the letter I wouldn't like to speculate on its exact content.
Some previously vocal members of the campaign have said they're no longer involved, others are keeping quiet, others are accusing the whistle blower of being a hypocrite.
Maybe the best strategy is to keep quiet and hope it blows over? Personally I think they should get out there and say exactly what went on, no matter how uncomfortable it makes them feel. It would show integrity and transparency, the latter being something they have been accused of lacking for months.
I had high hopes but as you say, it's now on its backside.