I was specifically asking about times the admins did it.
And, for the record, I have no problems with the /r/technology mods implementing such a filter. I want to read about technology, not politics. I actually unsubscribed from /r/technology some time before the filter was put in place (it was one of the very few defaults I'd unsubbed from, actually) because I was sick of it being overrun by political content.
http://www.dailydot.com/news/reddit-technology-banned-words/