The Republicans who want to be Trump's VP were once harsh critics with key policy differences

It’s hard to refer to someone as “Hitler” and end up in their good graces, let alone potentially become the person they choose to help lead the country. But Ohio Sen. JD Vance’s shifting position on Donald Trump over the years from one-time critic of the former president to staunch ally is a metamorphosis shared by many of Trump’s potential running mates. For sure, it's not unheard of for a running mate to move beyond past disagreements with a presidential candidate. But the shift is more striking for Trump’s potential running mates, in some cases requiring them to abandon long-held policy positions and recant vehement criticism.