This says a lot about political bases, too. I don't think that many people really see Oregon going Republican or Missouri Democratic in a tied election. I imagine it's just that the 2004 Bush voters in Missouri are more likely to be angry than in Oregon.
Obviously also some economics-related zaniness going on here too.
Yeah. Oregon is simply more polarized than Missouri. (Or another way of putting it: Bush had less soft support in the first place that has since eroded in Oregon than he had in Missouri.)