A search through the Senate IP address on Wikipedia shows which pages have been edited by Senate staff. The amateur Wikipedians who work for members of the Senate were a little more reserved than their House counterparts.
Senator Tom Coburn: A disgruntled Senate staffer added into his profile he is "a huge douche-bag."
Source: themoderatevoice.com / via: en.wikipedia.org
Vice President Joe Biden: While Biden was a Senator, a Senate staffer changed information in his biography related to the plagiarism scandal that helped doom his 1988 presidential run.
Source: didrikmariann.blognownow.com / via: en.wikipedia.org
Florida Senator Bill Nelson: A Senate staffer added that he "is generally regarded as a moderate."
Source: saintpetersblog.com / via: en.wikipedia.org
Senator Mike Crapo: An edit removed flattering statements made about Crapo by Senator Harry Reid
Source: cdn2-b.examiner.com / via: en.wikipedia.org