It’s shocking to think Issa’s district once went 63 percent for Bush in 2004. Redistricting was a factor, I’m sure, but it’s astonishing (and somewhat appalling) that that area he’s representing has gone so downhill since then (and by extension Orange County as a whole).
Go and look at the margins for the seats in the ‘80s. The legislative Dems had to produce some of the most astonishing gerrymanders to keep them with a majority of the delegation, while packing Republicans into hyper-GOP seats. At one point, even one of the San Francisco Burtons (John) was endangered with a Republican holding them to a low margin (51-45(!)%) in 1980. The state is no longer recognizable from those halcyon days.