The first official word that Clinton will seek the
One Democrat familiar with the campaign rollout said Clinton's stops would include visits to people's homes in those early states.
The people familiar with Clinton's plans spoke on condition of anonymity because they were not authorized to discuss them publicly.
The former secretary of State will be making her second bid for president and will enter the race in a strong position to succeed her rival from the 2008 Democratic primary, President
Should she win the nomination, Clinton would face the winner of a
Clinton will return to politics following a two-year leave from government. If elected, the former first lady would be the nation's first female president.
Republicans have been preparing for a second Clinton campaign since she left the Obama administration in early 2013. They intend to campaign against her by equating her potential presidency to that of a "third" Obama term, during which they argue she would continue his most unpopular policies.
Clinton's announcement was preceded by withering criticism over her use of a personal email account and server while she was secretary of State, as well as the Clinton Foundation's acceptance of donations from foreign governments.
She said at a news conference last month that she used the personal email account for convenience. Republicans running a select congressional committee reviewing the 2012 attack on a U.S. facility in Benghazi, Libya, which took place during Clinton's tenure at the State Department, are investigating her decision to delete thousands of emails she has deemed personal in nature.
By campaigning heavily in Iowa and New Hampshire, Clinton hopes to avoid making the same stumbles against Obama as she did in the 2008 Iowa caucuses, which he won in an upset. She also sees such campaigning as a way to demonstrate that she is not taking her formidable position in the Democratic field for granted.
Among the Democrats who could challenge Clinton in the primary are former Rhode Island Gov.