No, but that was before he was a huge star, and his name was not billed above the title.
Back then, if you're name was not above the title, you were not eligible for the leading category.
That is why Barbara Cook won a Featured actress for the very leading Marian Paroo in THE MUSIC MAN as well.
That's also why now, the same general rules apply - but producers and performers can petition certain performers to be in the leading category.
"If you are going to do something, do it well. And leave something witchy."
-Charlie Manson