Barack Obama and his wife Michelle remain two of the most beloved figures in the Democratic Party. (File)
Former US president Barack Obama formally endorsed Joe Biden's White House bid on Tuesday, saying his longtime deputy can unify and "heal" a nation struggling through some of its darkest moments.
"Joe has the character and the experience to guide us through one of our darkest times and heal us through a long recovery," Obama said in a 12-minute video.
"I believe Joe has all the qualities we need in a President right now," Obama said, adding that picking Biden as his running mate in 2008 "was one of the best decisions I ever made."
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