Clinton told CNN last month she had "absolutely no plans to run," but then emphasized she felt healthy enough for any challenge.

"I am lucky because I've been very healthy. I feel great," Clinton said. "I've got enormous amounts of energy that have to be harnessed and focused, so I'm very fortunate. I'm looking forward to this next chapter in my life, whatever it is."

The former first lady added that she hoped her future plans would include "working on behalf of women and girls, hopefully writing and speaking."

Clinton would be the heavy favorite for the Democratic nomination were she to run in 2016, and likely hold an early polling advantage over any Republican opponent. An ABC/Washington Post poll conducted at the end of her term as secretary of State found Clinton with a 67 percent favorability rating, far surpassing other members of the Obama administration.