9/11
From the John McCain and Barack Obama campaigns (Source):
"All of us came together on 9/11 – not as Democrats or Republicans – but as Americans," said a joint statement issued by both Senator's campaigns. "In smoke-filled corridors and on the steps of the Capitol; at blood banks and at vigils – we were united as one American family. On Thursday, we will put aside politics and come together to renew that unity, to honor the memory of each and every American who died, and to grieve with the families and friends who lost loved ones."
