There are about 6,000 Academy members. The votes are tabulated by a hired accounting firm. And the Best Picture winners generally tend toward the conservative side.
In my humble estimation the movies are awful. I believe a film called "American Beauty" won the award for best picture a few years back. When a friend of mine who saw it enthusiastically described the plot to me (I'd also read a number of reviews of the flick), I knew it had to have been scripted by a leftist nutter... down to the retired Marine officer who of course had to be a closet homosexual. And naturally the wisest person in the flick had to be a teenage doper. And remember Michael Moore's awful anti-American doc winning a few years back? I'd say most of the academy voters are strongly influenced by liberal propaganda.