When watching T.V. at any of your safehouses turn it to Weazel Network (clearly the spoof of Fox News), it's the channel with "Republican Space Rangers" on it. One of the commercials is for a western drama airing on TUESDAYS! called "Spittoon".

If you know Rockstar Games well enough you'll recognize the footage as being directly from Rockstar San Diego's 2004 title "Red Dead Revolver" - an excellent title I might add.