How much more evidence does one need?

Two and half years ago, two political scientists published a book that said (p. 188):

Anyone who criticizes Israeli actions or says that pro-Israel groups have significant influence over U.S. Middle East policy stands a good chance of getting labeled an anti-Semite. In fact, anyone who says that there is an Israel lobby runs the risk of being charged with anti-Semitism, even though AIPAC and the Conference of Presidents are hardly bashful about describing their influence. … In effect, the lobby both boasts of its own power and frequently attacks those who call attention to it."  

Over at The New Republic, Leon Wieseltier has provided the latest example of this all-too-familiar tactic, in the form of an incoherent and unwarranted smear of Andrew Sullivan.  Yglesias, Larison, and DeLong offer telling rebuttals.