Hillary Clinton has formally entered the 2016 race for the White House in a bid to become the first woman US president.
She launched her website, telling Americans she wanted to be their “champion”.
Mrs Clinton ran for the Democratic presidential nomination in 2008 but lost to Barack Obama reported BBC.
The overwhelming Democratic favourite, she had been expected to declare her candidacy for months.
In a video on her website, Mrs Clinton declared: “I am running for president”.
“Americans have fought their way back from tough economic times,” she said, “but the deck is still stacked in favour of those at the top.
“Everyday Americans need a champion and I want to be that champion,” she added.
Mrs Clinton was also first lady when her husband Bill Clinton was president.
This time around, Mrs Clinton’s path to the Democratic nomination appears much easier. Unlike 2008 there’s no inspirational, once-in-a-generation opponent like Mr Obama waiting in the wings.
There’s not even a charismatic, battle-tested candidate like former vice presidential nominee John Edwards or a Hispanic governor with foreign policy chops like Bill Richardson in the field.
But if Mrs Clinton’s nomination campaign will be easier, actually winning the presidency could be just as difficult – or more so.
Unlike 2008, the Democratic nominee will be defending eight years of her party’s rule, with all the baggage that comes with it.
Instead of facing a Republican Party on its heels, fresh from massive losses in both chambers of Congress, a nominated Mrs Clinton will have to defeat a Republican candidate with the political wind at his back.