143.231.249.138 has a number of goofy edits, and also seems overly concerned with Lyndon LaRouche's page. User was blocked for vandalism in 2008, 2009, 2011, seems like vandalizing the Wiki is their hobby.

https://en.wikipedia.org/wiki/Special:Contributions/143.231....

>That IP was blocked again today for 48 hours after serially vandalizing a congressperson's entry, a personal attack on an admin, etc. Since blocking, this edit to the IP's own talk page is clearly a declaration, perhaps less than constructive. Toddst1 21:34, 14 May 2008 (UTC)

>I don't know if it is a declaration, but it is lyrics to The Doors song "Light My Fire." KillerChihuahua 22:16, 14 May 2008 (UTC)

>Blocked again, for 55 hrs. KillerChihuahua 20:49, 27 May 2008 (UTC)

>I just blocked 143.231.249.138, an IP within the US House range, for 24 hours for disruptive editing: repeatedly removing negative yet sourced information from articles about Republican congressmen and refusing attempts to discuss. Daniel Case 14:16, 15 March 2011 (UTC)

https://meta.wikimedia.org/wiki/Communications_committee/Not...

Even more disturbing was the edit from the US Senate which changed Edward Snowden's page to refer to him as a "traitor" instead of "dissident": http://boingboing.net/2013/08/06/us-senate-ip-address-linked...

I'm more concerned with Senators and Congresspeople saying that in public rather than minor staffers screwing around on Wikipedia.