There were lots of bad reasons to oppose the $87 billion appropriation for occupying Iraq: not thinking that winning the peace is important, not wanting to spend money on furriners when we have needs at home, thinking $87 billion is an important amount of money in a $10 trillion GDP, hating Team Bush so much that you want them to fail, even if it means that the United States fails.
On the other hand, there were good reasons, such as not wanting to put out $87 billion for the war profiteers to steal.