Call me historically ignorant, but I had no idea that former President Lyndon Baines Johnson was a friend of Israel: http://www.iht.com/articles/ap/2008/05/28/africa/ME-GEN-Israel-LBJ-Tapes.php. Judging by his comments, he was a better friend to the Jewish state than an of his successors in the White House (though his immediate predecessor, John F. Kennedy, reportedly also harboured strong positive sentiments towards Israel).
One the theme, LBJ was also personally involved in the saving of Jews during the Holocaust: http://lennybendavid.com/2008/05/lyndon-johnsons-historical-connection.html. I am sure that among the thousands of people protesting the Vietnam war there were many Jewish people, and I wonder if among those who chanted "Hey, hey, LBJ, how many babies did you kill today?", any of them knew about this?