edit: the video below is not what I thought it was. The second part of my comment stands.

There's also video of the poll workers demanding that all Republican challengers leave.

https://twitter.com/_New_Revolution/status/13240914159246745...

There were hundreds of videos of poll workers behaving in ways that ranged from suspicious to obviously illegal. Many have since been removed from social media. I don't like Trump and never voted for him, but his supporters who watched video after video oddly reminiscent of those in the OP's thread aren't unreasonable in feeling cheated.