GENERAL KNOWLEDGE: The term Sesquiquadricentennial represents how many years ?

Questions

Paul Newman plays Louisiana governor Earl Long?

Tim Robbins satire about a right-wing, folk singing, Senatorial candidate?

Back to the Future 3 was set in one of Doc's favourite places, the __ __?

In BTTF 1, Marty & Doc must wait for _ so that Marty can get back to 1985?

In BTTF 2, Biff is rich in 1985 because of a book given to him in 1955 by ..?