Timing is a tricky thing. Perhaps the professional politicians such as Issa have a better hand at it. Maybe closer to the 2012 election?
Hopefully Issa, as well as Grassley, know enough to work this skillfully. I have some hope that they do from the way they have been methodically going about it. Also from the large number of agents who are whistleblowers. We have already seen some serious revelations from Melson, from documents made public and from Tuesday's testimony. Probable cause for more thorough digging is being made in spades.