Part of the “War on Women” Megyn rekindled—A non-issue that is hoped will propel Hillary into the White House. She got Trump with it and the Pro-Life people “You would see your wife die!” comments were right out of the Planned Parenthood playbook. She did more to help Hillary in that debate than anyone else in a month. She’s No RINO—she a full on Liberal Progressive.
IMHO any damage done, or any help to Hillary is the fault of the candidates for not being able to avoid the same old ‘gotcha’ moments that happen every election cycle. Megyn Kelly is a TV news commentator, with a family and children, and whether or not she has a political agenda (she's relatively conservative on some issues, not others seems to me), it is pointless and destructive to demonize her. Much better and easier to just say something along the lines of “Megyn, I don't know if this question is yours or one that you all decided upon as a group, but I don't think it's fair - and this is why....” Then just explain your position.
Commenting about her personally after the debate makes the candidate look petulant, elevates Megyn’s stature (or reduces the candidate's stature) to a level of equivalency, and just gives sound bite moments to the propagandists on the left.
Every Republican candidate showed know that the left will try to paint them as anti-woman, insensitive, bigoted, greedy (e.g. don't care about the environment as long as money is being made), rigidly religious - and anti-modern as a consequence (e.g. “clinging to guns and religion”), etc. They should never, ever fall into these traps. Never. It's campaigning 101, but they still do it, every election cycle.