Just spoke to the RNC 202-863-8500.
The man was under the understanding that the appointment will be voted on in January by all the voting members. Call your local offices to voice your displeasure.
It wouldn't be a bad idea to call Martinez's office and ask him nicely to NOT take it as it is a grueling position that he cannont possibly successfully manage while being a Senator.
That is what I have been saying. You need to call your national committee man and woman from your state and your State Chairman who sit on the National Committee. A new Chairman cannot take office permanently until they approve.