That’s a very clever and apt comparison- no question, on the campaign trail Romney was always playing a role. He was never a movement conservative, and had only the vaguest idea of how to relate to movement conservatives.
But the one BIG difference between Clark Kent and Mitt Romney is, Clark Kent’s disguise WORKED! Perry White, Lois Lane and Jimmy Olsen never doubted that Clark Kent was the bumbling, cowardly nerd he pretended to be. His act was so convincing, no one ever guessed he was Superman, even though his eyeglasses didn’t do much to hide that fact.
But very few movement conservatives fell for Romney’s act. Practically none ever believed for a second that he was one of them, though some concluded he was the best they could hope for this time around.