If you're going to make a persuasive argument, you will have to do some work yourself. Your research needs to support your argument, which is, by definition, not unbiased.

I suggest that you attack the efficacy of Bush's plan. You could knock down the WMD excuse by pointing out that under the UN peace, Iraq has used zero WMD against zero people. And the last time Iraq used WMD was during a war Things like that.