San Francisco mayoral candidate Mark Farrell could be in hot water over a new mailer he sent out that his rivals claim violates campaign law. Farrell’s mailer urges voters to support a reform measure but then on the backside touts his unrelated accomplishments as interim mayor. One side of the 8-by-11-inch card features a smiling Farrell urging a “yes” vote on the TogetherSF ballot measure, which would enhance mayoral power. The mailer was paid for by Mayor Mark Farrell for Yes on Prop. D,...