Quico says: Turns out somebody on Wikipedia also thought of mapping the 2007 referendum results, but at the municipal level. (Hat tip: Kepler.) This map makes the opposition's problem with rural voters even more stark.
By my count, the government won 224 municipios, the opposition 108, and 2 went down the middle. And you have to wonder what the hell is going in Anzoátegui: the only eastern state where rural municipalities voted No in numbers.
Speaking of Anzoátegui, spare a thought, if you will, to the 14,347 residents of Municipio José Gregorio Monagas (capital: San Diego de la Cabrutica). CNE simply didn't count any of their votes!
Los desaparecieron a toítos!
Update: Juan Cristobal helped expand the table of key "municipios" to include the 45 municipios that make up Venezuela's 30 largest cities. At the time of the 2001 Census, 56.2% of Venezuelans lived in these 45 municipios. Do click to enlarge: