NEW CASTLE, Del. (AP) - President Joe Biden marked his first Memorial Day weekend as commander in chief by honoring the nation’s sacrifices in a deeply personal manner as he paid tribute Sunday to those lost while remembering his late son Beau, a veteran who died six years ago to the day.As a cold rain fell, Biden made his annual appearance at the commemoration in New Castle, not far from his Wilmington home, a day before he planned to do the same at Arlington National Cemetery on the official observance.The death of his son from brain cancer at age 46 is ever-present for the elder Biden, with the loss defining so much of his worldview, dotting his speeches and stirring his empathy for others in pain.The Memorial Day weekend, long an.