CBS News headlines a story about political cross-overs: "Hillary Clinton: 'A lot' of Republicans want to help my campaign." Given how widely disliked Hillary Clinton is among Republicans, five (5) would constitute "a lot."
I believe there are a substantial minority who have qualms about voting for Trump. I doubt many of those will abstain, come November, and even fewer will vote for her. It is no fluke Republicans are the more motivated voters this year, she's the reason.