Nathan Fletcher Leaves GOP Weeks Before Mayoral Election - San Diego News Story - KGTV San Diego <excerpt> "Today I am leaving the Republican Party and becoming an independent," Fletcher said in the clip. "In my heart, I believe it's what's right and what best reflects my values. I also believe it's what's right for our city moving forward ..." Alluding to the contentious nature of the current political climate, he added: "I don't believe we have to treat people we disagree with as an enemy." Fletcher, who served a decade in the Marine Corps, currently represents the 75th Assembly District. He is running to replace Mayor Jerry Sanders, who will be termed out. nathan fletcher leaves gop - YouTube.