Considering that the DNC is shafting Bernie for 2020, and how Trump's approval rating is at about what Obama's was when he was reelected, I'd be VERY surprised if he didn't have another comfortable victory over her. Heck, I could easily see him winning in a landslide. Bernie having his nomination stolen from him a second time, would DEFINITELY erode support in the blue strongholds.
Jobs and the economy are going to keep support in the rust belt, very likely even expand it. He might even take some places like Vermont or Washington who have very strong Bernie support, and a not insignificant red presence. He could probably very easily make gains in Colorado, Maine, Minnesota, Nevada, New Hampshire, New Mexico, and Virginia compared to last time. Especially given voters' disinclination to upset incumbents.
right now, the only thing I could see preventing a landslide in 2020 is fielding a strong candidate (not Hillary) and/or Trump losing traction with his base and the center through a particularly bad showing in North Korea or a reversal in the economy/jobs because of mismanaging the trade war.
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