San Francisco (AFP) – A man was shot dead in the US city of Portland, police said Sunday, the latest violence to upend anti-racism protests as President Donald Trump presses an election message characterizing his Democratic opponent Joe Biden as weak on violent crime.But hours after the gunfire Saturday during a pro-Trump rally in the Oregon city, Biden accused the president of fanning the flames of violence in a polarized and tense nation.The shooting followed a week of country-wide protests — including the cancellation of numerous sporting events — over the police shooting in Kenosha, Wisc…