FWIW here is the relevant WHOIS lookup for the IP that this edit originated from:

    NetRange:       156.33.0.0 - 156.33.255.255
    CIDR:           156.33.0.0/16
    OriginAS:       AS3495
    NetName:        USSAA
    NetHandle:      NET-156-33-0-0-1
    Parent:         NET-156-0-0-0-0
    NetType:        Direct Assignment
    RegDate:        1991-12-03
    Updated:        2007-04-05
    Ref:            http://whois.arin.net/rest/net/NET-156-33-0-0-1
    
    OrgName:        United States Senate
    OrgId:          USSAA
    Address:        2 MASSACHUSETTS AVENUE, N.E. 6TH FLOOR
    City:           WASHINGTON DC
    StateProv:      DC
    PostalCode:     20510
    Country:        US
    RegDate:        1991-12-03
    Updated:        2011-09-24
    Ref:            http://whois.arin.net/rest/org/USSAA