This is what she said: "Rush Limbaugh said he hopes this administration fails, so you're saying, 'I hope America fails', you're, like, 'I dont care about people losing their homes, their jobs, our soldiers in Iraq'. He just wants the country to fail. To me, that's treason.
"He's not saying anything differently than what Osama bin Laden is saying. You know, you might want to look into this, sir, because I think Rush Limbaugh was the 20th hijacker. But he was just so strung out on OxyContin he missed his flight."
She then concluded: "Rush Limbaugh, I hope the country fails, I hope his kidneys fail, how about that? He needs a good waterboarding, that's what he needs."

http://blogs.telegraph.co.uk/toby_harnden/blog/2009/05/10/not_funny_barack_obama_laughs_at_wanda_sykes_joke_about_wanting_rush_limbaugh_dead