Hillary Clinton has dropped another hint she may run for the US presidency in 2016, telling an audience in the state of Arizona she was "very much concerned" about the direction of the country and was considering "all kinds of decisions" about her future.
The former US secretary of state and first lady, who was beaten by Barack Obama to the Democratic presidential nomination in 2008, said she was particularly keen to tackle climate change.
When asked by a member of the audience: "Ms Clinton, if you won't represent women in politics in America as future president, who will?" She replied: "Look, I am very much concerned about the direction of our country. And it's not just who runs for office but what they do when they get there and how we bring people together, and particularly empower young people."
Pressed further by television show host Jimmy Kimmel to give a clearer answer, she added: "I'm obviously thinking about all kinds of decisions." That drew a big cheer and knowing laughs from the friendly audience.
Clinton, who represented New York in the US Senate for eight years until stepping down to serve under Obama, has repeatedly said she has not yet decided whether to launch a second campaign for the White House.
Polls indicate that she would start as clear favourite in a party field that could also include Vice-President Joe Biden, and would be favoured in a general election against potential Republican nominees such as Senator Rand Paul of Kentucky and the New Jersey governor, Chris Christie.
She did nothing to dampen speculation about her future earlier in Saturday's event, while talking about the need for people who are committed to a public cause to keep trying even when their ambitions were thwarted.
"Too many people think that somehow if they don't get what they have worked for right away, that either they have failed or it wasn't meant to be, or they give up because they can't bear the energy or the disappointment of going on," she said.
Singling out climate change as a problem that jeopardised the "quality of life in so many places around the world", Clinton said "people are being ravaged by weather patterns and drought and so much else" due to rising temperatures.