According to this list provided by The Atlantic, 31 advertisers are still sticking with the Limbaugh show. I noticed at least one on the list (Carbonite) that has apparently pulled out since the list was compiled. However, as a taxpayer and a VA retiree, I am distressed to see that among the remainder is the Department of Veterans Affairs. I have always thought of the VA as one of the better federal agencies, at least in its provision of health care to its beneficiaries, especially given that it is one of the largest federal agencies. However, its use of tax dollars to support political speech aimed at denigrating women is unacceptable, especially given how many women veterans we now have who have given so much in service to this country.
The Atlantic gives this link to the VA to register complaints, but that is just the main VA site. There are some general phone numbers and email links there that may or may not reach the right desks. Possibly a better way to exert influence is to contact key members of the House and Senate Veterans Oversight Committees. The House Committee is here: http://veterans.house.gov/; the Senate Committee is here: http://www.veterans.senate.gov/
Since the House Committee is of course run by Republicans, you might get more traction by contacting its ranking member, Rep. Bob Filner of California. The Chairman of the Senate Committee is Patty Murray, who I'd hope would listen to our concerns. In my experience, one inquiry from one member of either committee will set the VA honchos a-trembling.
I'd also like to note that there are a number of other companies listed by The Atlantic that might be susceptible to pressure from a broad range of consumers, including Netflix, Capital One, and United Healthcare. Don't know if other diaries might have mentioned them, but it doesn't hurt to repeat...