Long lines have formed in front of a U.S. Post Office in San Francisco’s Castro District this morning as supporters of assassinated city Supervisor Harvey Milk rush to get a stamp dedicated to the gay rights leader, a postal service spokesman said. The stamp with Milk’s laughing face, name and a small strip of the rainbow flag, first became available this morning at post offices throughout San Francisco and nationwide. Gay civil rights activist Cleve Jones is at the Castro District post office, located at 4304 18th St., along with filmmaker Dustin Lance Black, who wrote the 2008 movie about...