Remaining true to its roots is one of the definitions of conservatism, and The National Review's recurrent racist references remind the reader of its segregationist past.
In the May 14th issue, they write:
"Hillary Clinton addressed Al Sharpton's National Action Network, and for the second time when speaking to a black audience (the first was at a Baptist church in Selma in March) her voice got positively...nappy.The normal Hillary is as flat as a menu on an 800 number, but with the brothaz and sistaz she drops her g's and gets the lilt thing workin'."
(emphasis - theirs)
And yes, they were aware of Imus, although of course their reporting on it was quite dishonest.