Having watched a fair number of ‘congressional investigation hearings’ (when I used to have access to CSPAN) which consisted entirely of supposedly adult ‘representatives of the people’ posturing, preening, speechifying, and generally behaving like five-year-olds, I can almost sympathize with Obama’s position....
I'd go along with that if you meant sympathize with "a President's position", in the generic sense, where there could be an assunption of some base level of loyalty to the US of A, no matter how inept or wrong-headed that loyalty may be applied. But this is Obama.
Yes, the Congress will preen and posture and politicize. It will be nauseating. But the lead up to that sideshow is of great value. Right now, the single most important thing is the preservation of evidence. A Congressional investigation puts into motion legal processes that preserves essential evidence. This administration and this congress might not have the will or the intent to follow it wherever it leads, but there's a big world of truth lovers who can and will--as long as the evidence trail isn't scrubbed.