Collusion between supposed political enemies has happened frequently throughout history
certainly shady deals between a couple of folks at the tops of parties is a possibility, but collusion between the thousands or tens of thousands of local volunteers of both parties?
It'd take quite a bit of money, though, this.
That is literally the definition of collusion.
https://en.m.wikipedia.org/wiki/Collusion#Examples
https://www.cambridge.org/core/journals/world-politics/artic...