That's not how Bill Clinton won, and that's not how Obama won really.
Anecdotally, I know many centrists that voted T as they wanted change &/or disliked Hillary, but are not really happy with T and are open to bolting IF Ds can offer someone not crazy, weak or out in left field
2018 told us how weak Ts base really is. Yes there are the rallies and fox news and lots of hype, but it's a lot of bullshit also. It always is with Trump, it isn't any different here.
Offer a competent, accomplished, fiscal conservative/social liberal (which MB is) and you can absolutely win.
Just don't scare suburbs with lots of new taxes and high promises to blow up the healthcare system and force them in to a tough choice.