From Vixen Strangely at Strangely Blogged:
You can read the text of former Secretary of State Hillary Clinton’s speech here. Clinton broke down point by point a handful of the very wrong things that Donald Trump has said with a brief explanation of why he’s very wrong. There might be some areas where Clinton’s perspective about policy and political reality differs from mine, but to see her define Trump as badly informed and of poor, not to say dangerously rash (OK–exactly to say that!) temperament was necessary.
This is something that no Republican primary challenger could have done, because in being knee-jerk opponents to anything President Obama has done, they at least had to support Trump’s constant, if wrong, criticisms. Clinton, as part of Obama’s circle, has an intimate knowledge of why some things were done, and not others.