Like all things in idiot Liberal Land, a refusal is an admission and a forgery necessarily contains nothing but the truth.
Liberals are so very smart.
What this tells you is that the DNC is worried about Kerry's base eroding. They figure that if they float this canard out there, it will be just enough for them to buy it and say "yeah Bush did this." They will believe it because they want to believe it, and the DNC needs them to believe it.