I keep saying that Trump's value as a candidate is immediate, rather than hypothetical. The payoff for candidate Trump is not 'If he gets elected' but 'right here and now'.
Trump's suspicions about the bias of the judge is not a bizarre conspiracy theory that has appeared suddenly and without cause from Malicior, the Hatred Dimension. It's, at the very least, a reasonable possibility. In other contexts - namely, in contexts where the authority in question was white - bias would be a front and center consideration in the media, complete with talk about how the onus was on the authority to do everything in their power to look unbiased. But this is White-guy Trump and the authority is Mexican, so the very suggestion at the possibility of bias - despite full blown La Raza membership - is supposed to be something no good man entertains. Even Newt Gingrich got in on the act of saying this was all terrible and Trump should stop that this instant.
Which, once again, makes Trump's decision to stick to his guns that much more laudable. If the media can question the bias of a white cop with a black criminal, or a white judge with an anything-but-white defendant, then scenarios where the roles are reversed are fair game for questioning as well.
Trump's dumping on that idea, and in the process, making it a whole lot easier for everyone else to do the same. In the process, he's making Republicans tear their hair out, all of whom have comfortably acclimated to being on the 'noble losers who no one thinks is noble' side for so long. I call that a double win.