Speaking on the phone with Chuck Todd, Hillary clarified that she does not campaign on what she is against but rather what she is for. Specifically with regard to trade agreements, she pointed out that some have been very good for jobs here so she evaluates them on a case-by-case basis. As always, Hillary was upbeat and specific. Her message is about what she is for not about what she opposes.
This is just my opinion: It seems that Bernie Sanders has pulled up stakes in SC and moved on to states where he thinks his odds of winning are better. That speaks to me, and it should speak to all voters. It means he sees people not as people but as votes, and if he thinks he can't win your vote, he turns his back on you and moves on to others whose votes he might win.
Hillary has stuck around, even though her odds in SC are very good. She has continued to meet with voters, addressed their concerns, and wants people to know that 1) she takes not voters or votes for granted and 2) she will fight for what is right for people even when they do not support her. It takes a true altruist to do what Hillary does.