<sod >Hundreds of mourners massed at a Sacramento church to honour and chant the name of Stephon Clark, who was shot by police officers in his grandparentsÃ¢ÂÂ backyard, and applaud calls for a collective response.< eod>< sod > ReverendÃÂ Al SharptonÃÂ has declared that "StephonÃÂ Clark has woken up the nation" asÃÂ hundreds of mourners gathered to honour and chant the name of the 22-year-old, who was shot by police officers in his grandparentsÃ¢ÂÂ backyard.< eod>