Not all gaffes are equal, some are minor and can be written off, this one is major. Anytime you’re talking about something violent and personal like rape, you’re on thin ice, and there is no margin for error.
If that seems harsh, well, it is. Politics is a harsh business, careers can be ruined in seconds and his wouldn’t be the first. If he wanted a more forgiving line of work he shouldn’t have gotten into this business.
Throwing him under the bus could be even more damaging to the party. It reinforces stereotypes that average Republicans out there are engaging in some "war on women." It looks like the party found such a Republican and told him he's fired. Let him stick around, make things right, explain himself, and we can counter the stereotype.
If that seems harsh, well, it is. Politics is a harsh business, careers can be ruined in seconds and his wouldnt be the first. If he wanted a more forgiving line of work he shouldnt have gotten into this business.