Absolutely. Kerry has an easy job: no attacks means there has been an exaggeration, any attack means the administration failed to protect us, again.
They kinda' cancel each other out.
In the end, the American people (at least those in the middle/still undecided as of 1 August), which are the swing voters and particularly those in the battleground states, would cut strongly in FAVOR of Bush if there were an attack on America.