There was a pall over Yosemite on Wednesday. Among rangers, employees, naturalists and visitors, there was an unsettling sense that something ancient and sturdy had become beleaguered, reduced to just another political football. “This was supposed to be the highlight of our trip,†said Gemma Edwards, 35, right, standing next to her boyfriend, Stuart Ackroyd, 33, in Yosemite’s Curry Village. The pair were visiting from Guildford, England. (Genaro Molina / Los Angeles Times)