Much of the debate in the San Fernando Valley contest between Reps. Howard Berman and Brad Sherman has revolved around their congressional records, but I’m having trouble deciphering them. And if it’s hard for me, after spending years writing about legislation, pity the interested voter. In their years in Congress — 29 for Berman, 15 for Sherman — they have cast many votes and introduced bills, either as a main author or collaborator. Because there’s a public record of this activity, you’d think it would be easy to look it up, rather than rely on the candidates’ speeches, charges and counter charges.