Why cover it up?

In a vote today, a House committee refused to issue a subpoena to the White House to turn over the documents relevant to the job offers made to Joe Sestak and Andrew Romanoff. Since the job offers may well have been federal crimes committed by someone in the White House, it is rather stupid for the Democrats to have voted against the subpoena. If nothing improper happened, the best way to deal with it would be to put forward all the facts instead of looking like an attempted cover up. There cannot be many relevant documents. It would probably take the White House an hour or so to furnish the documents and put the matter to bed. Unless.... Was there more to the story than the Clinton offer to Sestak? Was Rahm swimming in the Ses-pool? Did the president take part in this effort? It sure looks suspicious.