From Glenn Greenwald's August 6 blog post at Salon.com:

UPDATE: I've sent emails to many of the people and groups referenced here -- which I've posted here -- and will post any responses if and when I receive them.

UPDATE II: National Review's Cliff May: “It is wrong, outrageous and damaging for Rush Limbaugh to compare Obama to Hitler. ... Such hyperbole only serves to confuse and trivialize issues much more grave than tax rates and health-care plans.”

Previously:

Limbaugh: “Adolf Hitler, like Barack Obama, also ruled by dictate”