Ellen Lee Zhou, a San Francisco social worker running for Mayor of San Francisco, paid for a billboard that is raising controversy in the SoMa district. "I think it's interesting. I live in this area so hopefully, it doesn't cause too much controversy," said SoMa resident David Pham. The billboard located on Dore Street shows a cartoon of a woman with her feet up, smoking, and holding a stack of money. A man can be seen carrying a young girl with a quote under it: "Stop slavery and human trafficking in SF" and "Vote Ellen Zhou Nov 5th for Mayor."...