Both Perry and Cain self destructed,
That left Santurum and Newt who were almost designed to lose.
Santurum left his Senate seat booted by PA voters, then went to FNC.
and Newt left his House Speaker job resigning it because of all kinds of personal and professional problems, then went to FNC. He has too many problems+past baggage to list in this comment.
That goes back to my point. Romney had no real opposition last year.
Cain did not self-destructat least not initially. He was the target of a well executed attack. I will admit that this ultimately resulted his untimely, if self-inflicted, destruction. :)
My main point was Romney was no better than any of them. He won by default, and then he abandoned the race to Obamajust as the GOPe desired.