http://www.slate.com/articles/news_and_politics/politics/2015/09/stephen_colbert_s_emotional_interview_with_joe_biden_the_vice_president.html

As the father of a son, it was hard to watch Vice President Joe Biden talk about his son with Stephen Colbert. Biden talked about whether he’s emotionally ready to commit to a campaign after losing his son Beau in May. He told the story of the unexpected grief that ambushed him recently while in Denver. “I landed at a military base and I met a whole group of military families. ... And I was talking about them being the backbone and sinew of this country. And all of a sudden—it’s going great—and a guy in the back yells, ‘Maj. Beau Biden, bronze star, sir, served with him in Iraq.’ And all of a sudden I lost it.” I understand why.