President Obama's decision to assert executive privilege over Operation Fast and Furious documents not only failed to delay contempt proceedings against Attorney General Eric Holder -- it raised a whole new line of constitutional questions and challenges about the power of the presidency.

Republicans already are seeking more than 70,000 additional documents to answer their existing questions on Fast and Furious. The executive privilege claim opened up a new avenue of probing. 

The immediate question was whether the documents contained information so damaging that the president was willing to risk the bad PR by moving to lock them down. GOP lawmakers also questioned whether Obama's assertion was legitimate, later voting in committee that it was not appropriate in this case. And Republicans repeatedly suggested that the White House had tipped its hand, and acknowledged being involved in Fast and Furious discussions by asserting privilege over the documents in question.