In summary A large field of candidates is taking on unpopular incumbent George Gascón in the race for Los Angeles district attorney, but only four challengers are worth taking seriously. Next week’s primary will determine whether Gascón cruises to re-election or faces an uphill battle. The first round of the race for Los Angeles district attorney – one of the nation’s biggest and most closely emulated prosecutorial agencies – is down to the finish. A large field of candidates is arrayed against an unpopular incumbent, George Gascón, creating a complicated set of possible outcomes for next week’s primary.  Here, then,…