By NB Staff | August 29, 2008 | 4:00 PM EDT Share it Tweet it 0 shares On August 27th, during MSNBC's Dem convention coverage, Keith Olbermann makes a hand gesture to Rep. Steny Hoyer (D-Md.) mocking Chris Matthews "go[ing] off at the mouth." AppointmentsCampaigns & Elections2008 PresidentialHumorCaptionfests NB StaffBio | ArchiveNB StaffMore from NB Staff Like this article? Get more like this in your inbox for free! Thank you for subscribing!