George W. Bush: “I am very grateful for Spence's service and thank him for his sacrifice and hard work for America.”

We are heartbroken by the loss of life and the agony so many are feeling.

Violence and vitriol must be purged from the public square. Members of other political parties are not our enemies; they are our fellow citizens.

History will remember him as among the finest public servants of his generation – a patriot who brought integrity, high intelligence, and seriousness of purpose to every position.

Those who have lost their precious children are facing a grief no parents should ever know.