These mis-characterizations of the president's view on victory are important, because public support of the war is largely based on an expectation of victory. In a major USA Today/CNN/Gallup poll from three weeks ago 32 percent of the public said we can't win the war in Iraq. Another 43 percent predict victory, while -- critically -- 21 percent say "the United States could win the war, but they don't think it will."
If one adds that "could win, but don't think we will win" 21 percent to the 43 percent who predict victory -- one has a very solid 64 percent supporting the war.
Non-reality-based poll interpretation! You gotta love it. For example, if you add the 58% of the public who think President Bush is doing a "only fair/poor" job to the 40% who think he's doing an "excellent/pretty good" job, then you have a very solid 98% of Americans supporting Bush! Just think of the possibilities...
Update 8/26: Michael Koplow makes an excellent point in comments -- Blankley is also claiming that perceptions of the likelihood of US victory in Iraq translate directly into support or opposition for the war, but that isn't necessarily true.
But of course, assessments of the war and support for it are closely related. And if you look at the results of poll Blankley refers to, it found that 58% of Americans believe we won't be able to establish a stable democratic government in Iraq and 51% of Americans believe the Bush administration deliberately misled the American people about WMDs in Iraq. Other recent polls show that 61% of Americans want to bring our troops home in the next year, 54% think we made a mistake in invading Iraq, 54% think the war was not worth it and 56% think the war is going "moderately badly" or "very badly." So it's very hard to believe that more than 45% of the public supports this war right now.