The biography of Cary Grant on Wikipedia recounts a number of allegations that he had homosexual affairs, none of them proven or admitted. He did use LSD when it was still legal.
Cary Grant was a Republican.
Cary Grant's biography reveals many similarities, including a troubled childhood in which he was separated from his mother, assuming a succession of identities with several name changes, a move away from the country where he grew up including changing his accent, and rumors of bisexuality — all while cultivating a smoothly debonair outward facade.
One of the key differences is that the public knew Grant was an actor playing fictitious roles. A few learned that he was also putting up a front about his personality. The American public has yet become wise that Obama's personality is largely self-constructed to mask chasms in his inner identity.