Wonderboy, Bush was given near unanimous consent and support from the congress for the war. He messed it up, he ignored the advice of military advisors and allowed Iraq to slip into chaos.
He was told specifically to secure water and prevent riots and looting to maintain a sense of order and security. But they didn't, and Rumsfeld was on tv saying how the looting was a sign of them exercising their freedom.

Now, 4 years later, people are fed up. Democrats who supported the war, and even a good number of Republicans are sick of giving Bush a do-over. It's like getting a job and consistently fucking up and then blaming the bosses for wanting to fire you.
I just don't think Bush has it in him to ever get Iraq working. Because he'd first have to admit that he was wrong and that a change in strategy is needed. But Bush sees admitting mistakes as a sign of weakness instead of a sign of wisdom and evolving strategy. I think any of the front runners (dem or rep) would do a better job on Iraq, but do you really want to wait as troop and civilian fatalities go up over the next 20 months?

Bow ties are coool.