San Diego County was a bastion of conservatism 25 years ago. Soon we will be down to one Republican congressman. There were 3 Republican congressmen from San Diego County not too long ago.
Issa’s district is now part Orange County (San Clemente), and part San Diego County (Oceanside). In 2016 Issa only beat the Democrat by 7/10ths of a point. Issa’s opponent, Doug Applegate is a retired U.S. Marine Corps Colonel and Marine Corps Base Camp Pendleton is in the district.