This documentary is a couple of years old, but is still relevant to what is playing out today between the U.S. and Israel. The documentary centers around a policy paper written by Stephen Walt and John Mearsheimer back in 2006 critical of U.S. policy towards Israel. The two scholars later published a book expanding on the article (see links below).
An in-depth discussion on the impact of the Israel Lobby
Reports from NPR
See the Full Walt/Mearsheimer Paper (available for download).