Darrell Issa, a nine-term congressman who retired last year, will run against fellow Republican Duncan Hunter in California’s 50th district. Republicans Carl DeMaio, a former city councilman in San Diego, and state senator Brian Jones are also challenging Hunter, who is not giving up his bid despite a looming trial on corruption charges. The “GOP Brawl,” as Politico put it, enhances the prospects of Democrat Ammar Campa-Najjar, who lost to Hunter by 3.4 percentage points last November. As Robin Abcarian of the Los Angeles Times explains, Campa-Najjar has been telling voters “Whether in two years, four years, or 10 years....