Sen. Robert Byrd, the longest serving senator in U.S. history, is in serious condition in a Washington area hospital, according to aides to the West Virginia Democrat. According to a statement from Byrd’s staff released Sunday afternoon, the senator “was admitted to the hospital late last week suffering from what was believed to be heat exhaustion and severe dehydration as a result of the extreme temperatures. He was expected to remain in the hospital not more than a few days.” The statement added: “However, upon further examination by his doctors, other conditions have developed which has resulted in his condition...