Former secretary of state is expected to announce candidacy Sunday afternoon and then hit the campaign trail . Iowa sources say Democrats are preparing for Hillary to barnstorm the state Sunday and Monday . Social media posts will be followed by video and email announcements . New polls suggests the former first lady is slipping behind leading 2016 Republican candidates in vital swing states . New epilogue of her book 'Hard Choices ' reveals how becoming a grandmother inspired her to run for president . Comment: She's not running because she wants to, but rather because it would make sense politically.
Former secretary of state is expected to announce candidacy Sunday afternoon and then hit the campaign trail . Iowa sources say Democrats are preparing for Hillary to barnstorm the state Sunday and Monday . Social media posts will be followed by video and email announcements . New polls suggests the former first lady is slipping behind leading 2016 Republican candidates in vital swing states . New epilogue of her book 'Hard Choices ' reveals how becoming a grandmother inspired her to run for president . Republicans launch 'Stop Hillary ' ad campaign .