(By Travis Jensen) The new Potrero del Sol/La Raza Skatepark officially opened last Saturday in the Mission District. Hundreds of skateboarders came out for the occasion. Mayor Newsom and Jennifer Siebel were even in attendance. With lattes in hand, the two watched in awe as local rippers annihilated the park. The Mayor showed a particular interest in the bowl. The day’s shred meter was off the charts. Real Skateboards pro Dennis Busenitz absolutely destroyed every......