The right to be anonymous is part of the freedom of speech. The right to participate and not be identified is a staple of our society. It seems odd to me that we abhor the invasion of privacy by the state and yet willingly stomp on that right in the name of "the people's right to know".
Did anyone have the right to know who made the 1984 video? Absolutely not. Assuming his story is true, here's a guy who made a video in the privacy of his own home, distributed that video via an anonymous account, and probably knew full well that if his identity was uncovered, he would be unemployed. He believed in a candidate, and wanted to share his reasons via a non-traditional means. Now he's jobless.
Is that really the brave new world you're fighting for? Is that the transparency you want? A society in which people are outed for being supporters so they can be fired?
Anonymous speech is not only a virtue, but it's critical to the survival of our other freedoms.

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I disagree with the generalization of anonymity
There are times when anonymity is not only democratic privilege but is also necessary for a democracy to survive. It is at these times that factual, "secret" information can be exposed when it might not be otherwise.
However, for a presidential campaign, I would agree that anonymity has been abused in the past.