According to Michael Ian Black, Louis C.K. may have once made offensive comments about Sarah Palin, but he’s no Rush Limbaugh. C.K. on Friday stepped down from a scheduled keynote speech at the annual Radio and Television Congressional Correspondents dinner; the day before, Fox News host Greta Van Susteren wrote on her blog that she wouldn’t attend the event if he hosted, citing a drunken Twitter rant the comedian went on in September 2010 in which he made offensive, crude remarks about Palin. Black says comparing C.K. to Limbaugh, who has been embroiled in controversy over sexist.