How many Americans as of right now believe Oswald shot JFK?

if you look at all of the cirstances surrounding this event like jack ruby, the mafia, kennedy's girl friends and their ociates, oswald's communistic leanings, just everything involved i don't believe that this was just happenstance and believe it was some sort of conspiracy and oswald AND ruby were just patsies. i am not brilliant but to me, this is just common sense if you consider everything. but, i guess that we will never know for sure.