Sidney Blumenthal is the father of Max Blumenthal. Max is not a fan of Israel. It is peculiar how Sidney is such a neoliberal Hillary fan yet so defensive of Max. Clinton Adviser Sid Blumenthal's New Cause: His Son's Anti-Israel Book (2013):
A veteran confidant of Hillary Clinton has waded into a bitter argument over the explosive topic of Israel, defending his son’s intensely anti-Israel book from a liberal critic.
Sidney Blumenthal, a former New Yorker writer turned Clinton adviser from the White House to the 2008 campaign, has been waging an online campaign against Nation columnist Eric Alterman for negatively reviewing his son Max Blumenthal’s book, Goliath. The book was described by Alterman, himself a frequent critic of Israel, as “awful” and something that “could have been published by the Hamas Book-of-the-Month Club (if it existed).”
Clinton Foundation officials refused to respond to questions of whether the elder Blumenthal is currently on a Clinton payroll.
Sidney contacted Hillary by private e-mail during the her destabilization of Libya because he had various business ideas, for himself, and wanted her feedback and insights. He stopped after the U.S. ambassador was killed at the consulate in Benghazi. Hillary thought Sidney was very insightful, and had been forwarding excerpts from his emails to her staff and friends for years.

Sidney Blumenthal's Mosaic Mugshot by Kevin Vaughn, on Flickr