CMKM Diamonds Inc. (fka CMKX)

[janice shell]

if the play was about killing Obama would the reaction/viewpoint/acceptance be different ?

That would depend on whether whatever analogy was intended was legitimate. And I'm afraid Shakespeare's Julius Caesar is not "about" anyone but Julius Caesar. Can parallels be drawn with modern politicians? Yes.

why was "The Manchurian Candidate" censored before it's release in 1962 and now allowed to be shown until many years later ?

It wasn't. That's conspiracy stuff:

According to rumor, Sinatra removed the film from distribution after the John F. Kennedy assassination on November 22, 1963. Michael Schlesinger, who was responsible for the film's 1988 reissue by MGM/UA, denies the rumor. According to him, the film's disappearance, or what was claimed to be its disappearance, was not due to the assassination but a result of the movie's initial distribution running its course by November 1963. In those days it could take a film months to play across the country[7]. After all the initial screenings were over, it could resurface more than a year later in drive-ins and other cinemas that booked films that many would-be customers had seen already. Movie listings in The New York Times from January 1964 indicate The Manchurian Candidate was revived at a Brooklyn cinema at the time, which was two months after the assassination.

https://en.wikipedia.org/wiki/The_Manchurian_Candidate_(1962_film)