Former secretary of state is expected to announce candidacy Sunday night 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 .
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 .