Joe Biden said the following in Atlanta, as the Washington Examiner  reported:
“I will be straightforward with you,” he said in a speech in Atlanta, according to a pool report. “The most relevant factor in my decision is whether my family and I have the emotional energy to run.”
“Unless I can go to my party and the American people and say that I am able to devote my whole heart and my whole soul to this endeavor it would not be appropriate,” Biden said.
“And everybody talks about a lot of other factors: Other people in the race, whether I can raise money and whether I can put together an organization,” he added. “That’s not the factor. The factor is can I do it. Can my family undertake what is an arduous commitment that we’d be proud to undertake in ordinary circumstances?”
“The honest to God answer is I just don’t know,” he said