Depends on what you mean by defense.
If we count the Harriet Miers and Dubai Ports fiascos, then the list of 100% right talk radio supporters might be quite thin. If we leave these issues off the table, I would say that Pres. Bush was supported a LOT by Rush and Hannity (they are the two hosts I listen to regularly).
I cannot comment on Harriet Meiers, I know nothing about her that wasn't blown out there by the brilliant talk show hosts on our side.