The Democratic front-runner outlined her key policies in a speech to thousands of supporters on New York City’s Roosevelt Island.
Hillary Clinton, 67, pledged to support working families, saying: “America can’t succeed unless you succeed”.
The former secretary of state and first lady’s campaign team hopes to boost approval ratings, which have flagged since her soft-launch in April.
President Bill Clinton and their daughter Chelsea appeared alongside her.
Hillary Clinton promised to “make the economy work for everyday Americans, not just those at the top” if elected president in 2016.
She said during the rally: “Prosperity can’t be just for CEOs and hedge fund managers; democracy can’t be just for billionaires and corporations.
“It’s America’s basic bargain… if you do your part, you ought to be able to get ahead, and when everybody does their part, America gets ahead too.”
Until now, Hillary Clinton has held small events with selected audiences in early voting states such as Iowa. Saturday’s outdoor rally marked a change in gear for her campaign.
HillaryClinton hopes to make history as the first female US president. If successful she would also keep the White House within the same party for a third term.
She did not detail specific policy proposals on Saturday. Her aides say that will happen over the next few weeks on issues including the economy, jobs and college affordability.
Jennifer Palmieri, the Clinton campaign’s communications director, said Hillary Clinton plans to give a policy address almost every week in the coming months.
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