By Jeff Mason, Oct. 21, 2015, Reuters
Biden, who had been pondering a run since August, appeared in the White House Rose Garden with his wife Jill and President Barack Obama to say the window for mounting a successful campaign had closed.
"While I will not be a candidate, I will not be silent," Biden told reporters. "I intend to speak out clearly and forcefully to influence as much as I can where we stand as a party and where we need to go as a nation," Biden said.
Biden, 72, had been wrestling with his own doubts about whether he and his family were ready for a grueling campaign while still mourning his son Beau, who died of brain cancer in May. His son had urged him to run.