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Atlanta.- US Vice President Joe Biden said on Thursday he is trying to determine whether he has the emotional energy to mount a White House bid in 2016, but cannot say yet whether he can do it.

In his first extensive comments about a possible run for the Democratic presidential nomination, Biden said, “I can’t look you straight in the eye now and say I know I can do it”.

Biden (72), has been huddling with advisers for weeks to determine whether he will challenge Democratic front-runner Hillary Clinton, who has seen her favourability ratings plummet over her use of a private email server while working as the nation’s top diplomat.

“The most relevant factor in my decision is whether my family and I have the emotional energy to run,” said Biden, who lost his son, Beau, to cancer earlier this year.

“The factor is, can I do it?”

“The honest to God answer is I just don’t know.”

Biden was in Atlanta on Thursday night to deliver a foreign policy lecture.- Reuters.