We look at facts and see a clear distinction between two situations. When George W. Bush believed it was necessary to invade Iraq, he asked for a congressional resolution authorizing the attack, and he got it. Hillary Clinton, John Kerry and Joe Biden were among the senators who voted to authorize Bush's action. He went to the United Nations Security Council and got a 9-7 vote in favor, but that wasn't enough because the French and the Russians used their veto power. Still, he got a majority.
