William R. Clark Sr., 70, of Lewiston,             He was born in Portland, the son of Leo and Patricia Clark.  He was a 100% disabled Vietnam Veteran. He was a fighter with a powerful voice, who was always searching for the hidden truth. He was also very quick to speak his mind. His passion for the poor was extremely proven. He was known to "give the shirt off his back."             He is survived by his son William Clark Jr. and daughter Kristen Clark, and his two grandchildren Seth and Libby Clark. Visiting hours will be held at Blais and Hay Funeral Home, 9-11AM Tuesday, June 6, with a graveside service to follow at Calvary Cemetery. Online condolences can be expressed at blaisandhayfuneralhome.com