"Donald Trump has absolutely NO credibility with me."
I don't agree with Trump politically by any means (he's all over the map, and he's defintely not a Conservative)... but I'd much rather have him be on the offensive about things like this than Romney being constantly off message, and always on the ropes about his tax returns and Bain.
Romney and the credible voices need to hammer Obama on the "dinner table" issues, and let the surrogates duke it out over the personal stuff.
Axelrod loves to play this game where he comes up with psychological personal attacks that all of his minions parrot... leaving Obama to "hover above" it all (he's doing it now with Harry Reid, and he did it with the gross attacks on Sarah Palin's family in '08). While not the most important issues of the day, personal attacks need to be addressed somehow. I don't want to hear Trump talk politics... but I think he's very effective in aspects like this.
Trump is at least playing offense. Romney likes to stay on defense. Hard to win playing defense only.