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Vice President Joe Biden, right, rests his head in his hand during a viewing for his son, former Delaware Attorney General Beau Biden, Thursday, June 4, 2015, at Legislative Hall in Dover, Del. Standing with Biden are Beau Biden's widow, Hallie, from left, granddaughter Natalie and wife Jill. Beau Biden died of brain cancer Saturday at age 46.  (Jason Minto/The Wilmington News-Journal via AP)  NO SALES
Vice President Joe Biden, right, rests his head in his hand during a viewing for his son, former Delaware Attorney General Beau Biden, Thursday, June 4, 2015, at Legislative Hall in Dover, Del. Standing with Biden are Beau Biden's widow, Hallie, from left, granddaughter Natalie and wife Jill. Beau Biden died of brain cancer Saturday at age 46.  (Jason Minto/The Wilmington News-Journal via AP)  NO SALES

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    Friends & family gather to honor Beau Biden, V.P.'S son

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Friends & family gather to honor Beau Biden, V.P.'S son

Mourners pay tribute to Vice President's son. CNN's Sunlen Serfaty reports.

Friends & family gather to honor Beau Biden, V.P.'S son

Mourners pay tribute to Vice President's son. CNN's Sunlen Serfaty reports.