In the heat and humidity of the Democratic primary, the gaps between the candidates on the issues gradually become the San Andreas fault line in the blockbuster film San Andreas starring Dwayne "The Rock" Johnson. That's particularly true on healthcare, where every candidate from Joe Biden to Bernie Sanders has run on expanding access to coverage, but every debate has played host to a scorched-earth war-of-words—cheered on breathlessly by the moderators—where the centrists and the progressives somehow come to seem diametrically opposed to one other.