Newt can.
Romney can't, and neither can Cain...IMO.
I’ve heard this many times about Newt and his “brilliance”. the problem is that he will have an image problem. The Dems will eat him for dinner and I can already picture the ads. We have also seen Newt in previous debates likes these...see, Kerry and Newt. He rolled over; why should now be any different? Finally, do these debates really matter? Do they influence a large amount of people? Not hardly. Most voters will be watching things other than the debates.