Government still withholding thousands of documents on JFK assassination - Nation - The Boston Globe
I do not believe any historian or researcher has all the information about the JFK assassination yet.
As far as lobbyists controlling the politics of the US, I doubt if that is true. Hurricane Sandy played a big part in the 2012 elections and as far as I know hurricanes do not care who is hunkering down when they are coming in, this just stay on whatever course nature put them. "Chad' and FL local politics played a big role in the 2000 election. The 2008 election seems like it was McCain's bucking the lobbyists with the choice of Sarah Palin that gave Obama the election.
Of course, advertising costs for elections do really bring the lobbyists into play a great deal.