Evidence shows Sen. Lindsey Graham (R-S.C.) died of an aortic dissection, which medical officials say is a rare and life-threatening condition that requires immediate emergency treatment. Graham’s death at age 71 was announced by his family on Saturday night. On Sunday, the Medical Examiner of the District of Columbia reported that preliminary findings show his cause of death was from an aortic dissection due to arteriosclerotic cardiovascular disease. That means an aorta rupture that stemmed from the hardening of Graham’s arteries. Graham’s office said on Saturday that the senator passed away after a “brief and sudden illness.” “Senator Graham’s family appreciates prayers at this time and asks for privacy during this incredibly difficult period,” the office said in a statement posted to social media....