At the start of last month, a small cadre of animal rights protestors snuck onto the Golden Gate Fields racetrack, lay down with arms interlocked in pipes, and halted live racing--as well as a vaccination drive on facility grounds--until police intervention saw their removal. While the incident had a flash-in-the-pan quality, it had the corollary effect of reminding those within the sport here in the Golden State of the somewhat precarious position in which it still finds itself--an important part of the economic puzzle, employing tens of thousands, but one...