An ad for Chuck Poochigian criticizes Jerry Brown's crime record as mayor of Oakland, describing the city as "one big murder scene."Chuck Poochigian, the Republican nominee for state attorney general, is broadcasting two 30-second television ads around the state. Here is a text of one of the ads and an analysis by Herbert A. Sample of The Bee's San Francisco Bureau.•NARRATOR: The Jerry Brown watch, part five.•UNIDENTIFIED MAN: Hey, it's our own political expert. What's up, man?•SECOND UNIDENTIFIED MAN: Well, I just found out that Jerry Brown, who wants to be our attorney general -- the top cop -- pardoned...