Someone Took the Brown Acid

Mark Steyn at the Corner says that Michelle and Barack Obama are pessimists.

What?

We've got one candidate, John McCain, whose entire campaign is going to be about spending 100 more years in one war, the inevitability of others, and the horror of terrorist attacks. We've got another candidate, Obama, who speaks of the things we can do as a nation to make ourselves better, and how he believes we can do it. Hell, his campaign slogan is "Yes We Can!" How exactly is that pessimisitic.