Bush makes a big deal about promising security against terrorist attacks on US soil.
Likely terrorist targets include large cities with great symbolic and/or material importance. New York. DC. Los Angeles. Chicago.
Consider that the people voting in those places have the most at stake when it comes to the possibility of violent attack by terrorists. They may not be merely wondering whether their psychological confidence in the United States will be shaken again. They may well be worried about dying. What do they think about Bush's promise?
Clarification: I made this argument up, but I don't think it's a good argument. Maybe I should have added "spurious" to "snarky".