Hailed as a consummate public servant and champion of the environment, former Florida Gov. and U.S. Sen. Bob Graham lay in state Friday in the Old Capitol as about a thousand mourners paid their respects. Graham, 87, died April 16 at a retirement home in Gainesville. A military honor guard and Florida Highway Patrol officers carried Graham’s casket, draped with white flowers and greenery that evoked his commitment to the environment, into the Old Capitol as the Florida A&M University Gospel Choir sang “Walking into the Light” by Aretha Franklin. Graham’s family — including his widow, Adele, an…