The biggest mistake in the Trump-judge flap is that the candidate elevated his personal lawsuit to prominence in the campaign at the expense of other issues.
The dissatisfaction with the judge is his issue and one can make a case that Trump's positions could provoke negative treatment from people strongly linked to Democratic causes. So have your lawyers take care of it...but Mr. Trump seems one of these people who doesn't let water flow off the duck.
However, that's not an argument you win when it intersects with race, the favorite topic of much of the media.
When he won Indiana and clinched there was a chance to focus on Mrs Clinton and charm the voters and your own party.
Now some wonder if he really wants to be President. It's a hostile media environment and the candidate needs to show some control.
The issues favor Trump and his likely opponent is flawed and not liked. This is a winnable race, but not if this continues.