sycasey said:
Issa's seat was redistricted to include more liberal areas, true. I don't think it's correct to say it was "gerrymandered," because gerrymandering means politicians or political parties setting up district boundaries to protect themselves. Given that California uses an independent panel to set district boundaries, there's no real evidence a partisan gerrymander happened to Issa. It may just be a consequence of that whole area becoming more liberal in general as population grows.
Rohrabacher's seat was indeed rated as a "tossup" by 2018 election time, however in Rohrabacher's previous election he won 58-41. In the one before that he won 64-36. So this result is a big shift in a pretty short time.
https://en.wikipedia.org/wiki/California%27s_48th_congressional_district
I respectfully disagree. The Commission is basically a bunch of cronies picked by the Assembly Speaker, the State Senate President and the minority leaders in the State assembly and Senate. Add 3 "independents" selected by the parties. Not hard to believe they could come-up with safe districts. In fact, has been the subject of several lawsuits.
For example:
The commission intentionally diluted African-American votes in three Los Angeles Area districts and packed several Hispanic districts in order to keep the three African-American incumbents in place. The suit claims that this alleged racial gerrymandering caused ripple effects for other districts throughout the Southern Californian region, raising further issues of compactness and state constitutionality.
One such disrupted congressional district is, according to the suit, the 47th, which starts at Long Beach and reaches into portions of Orange County. The suit argued that the plan cuts the Orange County Asian community known as "Little Saigon" in half. The court acknowledged that in fact there was racial gerrymandering, but that the redistricting commissioners are public officers rather than public employees, and therefore beyond the reach of the state constitutional provision prohibiting discrimination or favorable treatment based on race. (Connerly vs. California)
There was then suit based on the Federal Voting Rights Act that the Commission had created safe seats and racial gerrymandering brought by certain Republicans (those with safe seats didn't object). This case made it no where, since the courts said that gerrymandering based on political affiliation and taking into account race is okay under federal rulings.
Which gets us to what happened in Orange County. The 47th Districts was suppose to go to a Hispanic candidate and didn't because of greater turnout by Asians. The winner was an Asian woman who was a former aide of the prior GOP congressman in the District, Ed Royce, in a fairly tight race (edit: at least last I heard, it may have changed). Interestingly, this is exactly was the point of the legislation, to have more competitive districts, but was not the result even the court agreed the Commission was seeking, which was a Hispanic winner.
The fact that they took the entire red inland area of San Diego and Riverside out of Issa's District in 2012 was an attempt to give a safe GOP District for Hunter, by literally taking out the San Diego coast line and putting it in another District. That is by definition gerrymandering. So much so that the reconstituted 50th District chose to elect a Republican under indictment rather than vote for Democrat. This came at the expense of Issa, who got a slightly blue or neutral district. Just look at the cut on the San Diego county map, its obvious what that the attempt was to divide the red inland County from the coastal blue. There is no other reason to divide the county this way. Bi-partisan gerrymandering is still gerrymandering.