San Geronimo Valley voters last month approved a special tax to support the Lagunitas School District by the largest margin ever. According to the latest count, Measure A claimed 78 percent of the vote, surpassing the 72 percent the measure received in 2017, the last time it was on the ballot. “Receiving 78 percent of the vote was extremely gratifying and a huge relief,” said superintendent Kathleen Graham, who had worried that economic anxieties about…