Donald Trump
Chris Christie and Charlie Baker face very similar political circumstances – Republican Governors in deeply blue Northeastern states. Mitt Romney strongly considered Christie for his presidential ticket. But when all three had to decide on a Donald Trump Presidency, at one of the last junctures where he can be derailed from the GOP nomination, only the Massachusetts men said “no.” If Trump wins, Christie is culpable. Governors Baker and Romney decided quite differently.
So,
yes, the GOP needs more Baker and more Romney.
It needs more Massachusetts and far less Jersey.
Candidates, campaign operatives, high profile donors and endorsers, media analysts, and reporters all have very strong incentives to base their electoral projections primarily on factors that their target audiences both understand and believe credible. Unfortunately, that means willfully discounting the single most potent and predictive factor in election outcomes, party identity. Of course, if campaigners, pollsters, and media pundits took the role of party leanings more seriously, most of them would be out of a job.