His death detonates far beyond South Carolina. A crucial Senate seat is suddenly vacant in the middle of a volatile election year. Allies in Kyiv, Jerusalem, Brussels and beyond are mourning the loss of a man who, whatever one thought of him, never wavered on America’s role in the world. At home, Republicans must scramble to replace not just a candidate, but a strategist, a fundraiser, a bridge between factions. History will argue over Lindsey Graham’s choices. No one will argue that his exit leaves a dangerous silence.