my assessment of Romney---and perhaps the ONLY redeeming factor he has---is that I think he is both ruthless and sneaky. And that's good. He will let surrogates attack Obama, while (wisely, I think) Romney avoids Newt-like specific "plans" and "programs" and sticks to broader themes of "new beginnings" and the like.
More important, Romney has to only stay even for 2 months, then when there is really not enough time for the media to mount a defense. Just keep up a steady pace, like Secretariat, until the final turn. Then pour it on!
At least that would my advice if I were advising him.
That is my opinion too. He his allowing the Obama machine to burn through their money, with little effect in the polls. In a couple of months, Romney will unleash on Obama.
The risk here is that the Obama campaign will get the chance to define Romney, if that happens, its bad news for Rom. I am sure the Romney camp is out there polling and getting a feel for how Obama's adds are (not) working.
This rope-a-dope wont go on for much longer.