Why is President Bush saying that America must stay the course in Iraq?

When will Americans understand? Losing this war means a less stable oil supply. Losing the war will most likely mean $100+/bbl oil, $5.00+/gal gasoline and 20%+ unemployment. This is what President Bush is referring to when he says it [a stable oil supply] is in the national interest of the United States.

And what is really shameful is that the Democrats all know this to be true.