So far we have Republican offices vandalized (North Carolina: http://www.nbcnews.com/news/us-news/nc-republican-office-fir... and Delaware: http://fox59.com/2016/10/18/vandals-throw-bricks-through-win...)

I didn't find a "well armed" anywhere in WaPo article. Honestly, I have no problem with monitoring election process (as well as any other government/public process). This things should be transparent.