If ANYONE stumbles, they will be attacked. Don't make this out to be a contest between jackals and a little lamb. That's dishonest. This is hard ball politics; it's the nature of the contest.
Trump stumbles, he's attacked. Bush stumbles, he's attacked. Cruz stumbles, he's attacked. Even if Ben Carson stumble, advantage WILL be taken. That's how it is. Get used to it. It has nothing to do with tender mercies, experience or inexperience. This is being played for the ages, there is no forgiveness.
All those rationalizations I cited came from other FReepers on other threads over the last few days.