Romney does not appear to be suffering; but if there are wounds; they are largely, self-inflicted.
As to Romney suffering, he's got some deep problems if the candidates care to highlight them. There are no long knives necessary, simply the nerve is needed to take on the record of Mitt.
Romney care; Belief in global warming; a record of inconsistencies and flip-flops as bad as John f'n Kerry.
If the candidates cannot highlight those things, they don't deserve to be running, if the press thinks that's "long knives" they are dumber than I've previously thought.