From James Fallows, we have the 28th Amendment, to be filed under Wishful Thinking:

“No Person shall be elected President or Vice President without accepting a session of questioning by the press, such session to last no less than one hour and to be open to normally accredited members of the press in the same fashion as at Presidential news conferences. The questioning shall occur and the results shall be made freely available to the public at least one week before an Election is held.”

As great as it would be to have an amendment in the US Constitution to ensure that candidates for President and Vice President is scrutinized directly by the Fourth Estate, it would be a lot easier if presidential nominees simply picked running mates who were capable of holding a press conference and did not to be sequestered from the media to avoid politically damaging moments.