In an interview with GQ magazine, the former senator and now vice president, who twice has run for president, says the first judgment he'll make about whether to seek the Democratic nomination is to determine whether he has the energy for it.
Second, the 70-year-old Biden says he'll ask himself whether he's the best person for it.
Biden is seen as a possible contender to succeed President Barack Obama, as is former Secretary of State Hillary Rodham Clinton. Democratic insiders say Clinton would start out as the heavy favorite if she entered the race.
Biden says he can die a "happy man" without ever becoming president, but says that doesn't mean he won't run.
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