How small is the California prison population likely to become if Gov. Jerry Brown has his way? In three years, California's prison population would be 20 percent smaller. When we chatted on the phone on the issue last week -- always an experience -- Brown sounded more like his old self, a left-wing talk-show host of the 1990s, than the tough-on-crime Oakland mayor and state attorney general who followed. There are always two Jerry Browns. There's the talk-show Brown who likened American incarceration rates to "absolute oppression." A decade later, Attorney General Brown fought three federal judges, who ordered California...