I think there is a logical continuation. There are plenty of IP addresses owned by private companies that have mentions in wikipedia. Link changes done from those IP ranges with edits of articles that mention entity IP ranges belong to. Why stop at Congress when we can have similar data sets for Google, BP, Yahoo, Apple, etc.
What about other countries (Finland, Sweden, Estonia, Germany, France, Australia, New Zealand, Iceland, Singapore, China, India) or organizations (Microsoft, Google, Yahoo, Apple, Tata, Baidu, So, Pfizer)? Is there generic platform where information about IP ranges can be entered? Or are this 'one off' projects? Why not to make generic solution?
If you can identify the IP ranges you can configure anon https://github.com/edsu/anon to listen for edits from them, and announce them using a particular Twitter account.
Honestly, I just put anon together in a few hours, and didn't put a great deal of thought into it. It might make sense to do what you suggest, and create a more generic webapp to deploy on Wikimedia labs, which manages the IP ranges, and Twitter accounts to post to.
Its not about who exactly made edits imo, more like from which circle it came from. It is interesting to see which edits folks from congress make.
Same would be with presidential and pentagon circles.
Just launched @PakistanEdits Unfortunately IP addresses of Govt. owned institutes are not available but its fun to see what is being edited from the whole country :-)
Nothing tweeted yet except mention of the US Congress one, corresponding accounts also for Canada and Sweden and a mention of IFTTT and code at https://github.com/edsu/anon
And because it's wikipedia, we can harvest this data all the way back in time!