Carbonite is the sixth sponsor to leave him. It looks like the second part of their initial response was key, John in Kansas. Here's what the CEO posted on Facebook, according to ThinkProgress:

No one with daughters the age of Sandra Fluke, and I have two, could possibly abide the insult and abuse heaped upon this courageous and well-intentioned young lady. Mr. Limbaugh, with his highly personal attacks on Miss Fluke, overstepped any reasonable bounds of decency. Even though Mr. Limbaugh has now issued an apology, we have nonetheless decided to withdraw our advertising from his show. We hope that our action, along with the other advertisers who have already withdrawn their ads, will ultimately contribute to a more civilized public discourse.

~ Becky in Tucson