Sylvester Stallone envies former Hollywood hardman Arnold Schwarzenegger -because the Californian governor is so ambitious, he's "a freak of nature". The Rambo star admits he is impressed by Schwarzenegger's career focus which has seen him carve out a successful career in American politics. And Stallone insists the former Mr. Universe has the potential to make it to the White House - if he was eligible for election. He says, "Arnold definitely played his career better than I did, he's a freak of nature. He's brilliant - he's had three stellar careers, and he was the epitome of greatness in each of them. "His ambition is frightening, if they changed the U.S. Constitution he could become President."