Andrew Sprung compares Bush to Obama:
Obama's "trust me" is different in kind from Bush's. Bush meant "trust my gut," trust my good-faith effort to keep America safe, trust me not to abuse an authority that acknowledges no Constitutional bounds whenever a threat to national security can be invoked. Obama's trust me means "trust the process as I lead you through it."
That leaves ample space, of course, to oppose his policies on the merits. I for one am not convinced that we should accord the government the power to detain persons without trial. But I would be disposed to listen assuming Obama makes the case in more detail.
Obama is scrupulously careful about laying down the rules of engagement when he seeks a new authority. Supporters need to be equally rigorous in developing criteria to support or oppose. Personally, until I see evidence of an egregious error in judgement, I remain disposed to give him the benefit of the doubt.