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Remember, if Holder does what we here feel is necessary, he is going directly against Obama. If Obama did what we feel is necessary, he'd be going against a vague coalition which we can outline in the Senate (all Republicans, Lieberman, various Blue Dog Democrats) and the interests and voters that lie behind them. In other words, the political risk and therefore the courage needed, is much higher for Holder than for Obama.
On the other hand, perhaps it is easier for Holder to take the long view. E.g., should he even worry about whether Obama gets reelected?
I wish there were professional organizations of lawyers who took an unequivocal stand on this. While it might not stiffen the spine of a President, it might do so for a wavering Attorney-General. Namely, the knowledge that in the opinion of many, many respected colleagues, he will be doing the right thing.