Abraham Lincoln
Lincoln warned the South in his Inaugural Address: "In your hands, my dissatisfied fellow countrymen, and not in mine, is the momentous issue of civil war. The government will not assail you.... You have no oath registered in Heaven to destroy the government, while I shall have the most solemn one to preserve, protect and defend it."
He married Mary Todd, and they had four boys, only one of whom lived to maturity.
Lincoln never let the world forget that the Civil War involved an even larger issue. This he stated most movingly in dedicating the military cemetery at Gettysburg: "that we here highly resolve that these dead shall not have died in vain--that this nation, under God, shall have a new birth of freedom--and that government of the people, by the people, for the people, shall not perish from the earth."