Donald Trump’s outburst of nativistic racism—viscerally and putridly displayed by his “go back” tweet-attack on four congresswomen of color, and the subsequent and shocking (even for Trump) “send her back” rally in North Carolina on Wednesday night—has been a clarifying moment. It seems the culmination of his years-long effort to fashion a politics of white identity, racial resentment, and hatred, even though a new bottom will likely be hit tomorrow, or the next day, or the following week.