What would it take for one of these cowards to actually break from Trump? In all likelihood, they'd have to see hard evidence that their continued support for him is actually hurting them at the polls. Forget America First. For Ryan and McConnell, it's Me First.
Whatever you think of the current election, the Trump strategy is worth taking a look at, because it has been both Trump's key to success but also the source of his currently declining poll numbers. Trump has rewritten the rules, but also authored the guidebook on how to potentially defeat him.