[Rocky]

The fourth estate will take the Fifth and refuse to answer.

The whole thing (Democrats + WaPo) appears to be a fishing expedition to extract info on the Koch family businesses for future use by Democrats. I doubt that it has anything to do with the XL Pipeline.

[Cboldt]

-- The fourth estate will take the Fifth and refuse to answer. --

They'll assert press privilege, if they reply at all.

Now, what might be fun would to have the letter come from discovery, after Koch sues WaPo for defamation.

[Ann Archy]

The Fourth Estate is the Fifth Column.