Biden digs in on candidacy in battleground state amid age doubts

Detroit - 'I promise you,' said U.S. President Joe Biden, as he stood before a small crowd of supporters crammed into a Detroit diner - including a 4-year-old boy with a halo of blond hair, named Beau like the president's beloved late son - 'I am OK.'

Young Beau gazed up at the 81-year-old president from his mother's lap and giggled as Biden spoke in an automotive-themed diner in Detroit's wealthy western suburbs