Well, I think the Secretary of State would need access to all diplomatic traffic; wouldn't you think?
NO, not to have 250,000 classified documents at her desk. Nor more tha Gates has access to the thousands of classified docs in the DoD. Only a few members of Congress are cleared to have access or be briefed to some intel. Remember Leaky Leahy? DoD still clears who in Congress can be briefed on what.