Start by looking at the following clock. (Click on it to enlarge.) The green sections represent the minutes within the hour that belong to your local affiliate.
Now listen to the Rush Limbaugh show (it's hard, I know, but you only have to listen to the ads!) Any commercial you hear in those time frames are from a business inside your own area. Make a list of local advertisers; post them on Facebook if you can and tell people to call and write them.
Then contact the businesses politely by mail and give them 48 hours to discontinue their advertising. If they do not, get a group together and do one or all of the following: 1) Have many people call the businesses on the phone; say you'll pull your business from them if they continue to support Rush 2) Do a letter writing campaign and deluge them with letters 2) conduct a campaign against them on Twitter and Facebook, 4) Stage a protest outside their businesses. Be sure to invite your local TV stations and newspapers!