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It's easy to see why we need to be critical of Barack Obama, at least for those who have developed the skill of imagining oneself in another person's shoes. Imagine yourself as Barack Obama, and wanting to do the right thing, but surrounded with scoundrels and idiots and afraid of what they can do--you have to be careful. You will have difficulty doing the right thing unless those with whom you actually agree make it painful to do otherwise.
(For example, what we saw with the FISA-gutting bill was likely, in part, Obama's realization that FISA-gutting was so important to the weak, corrupted scoundrels who run Congress that they would thwart any attempt to enforce FISA, regardless of popular pressure; I mainly wish that Obama had found a better way to acquiesce than to lie to the public about what was in the bill.)