Michael Savages' invitation for presidential candidates

As a conservative,I have tuned in on the debates over the past few months and especially talk radio.Conservitave information needs to get out to the masses.Michael Savage is his own voice.Some like him,some don't.He takes what is known by millions of Hannity and Limbaugh listeners and turns up the heat.No democratic candidate would dare appear on the savage nation and also,the GOP has declined to appear.Why?After Michael has invited the GOP front runners to appear on the savage nation many times.Just makes me question why? Gullianni,Thompson,Rommni and the others have talked extensively to Hannity and Michael Medved.Scared are they? Who knows.