Because his party for the last 8 years have been contributing to defeat of George Bush's Foreign Policy which probably has lead to soldier's death and loss of morale.
yesterday at Camp Lejeune? The word VICTORY seemed to just get stuck in his craw and he couldn't spit it out, why? Why couldn't he acknowledge the obvious? We won, Iraq is well on its way to being a stable, representative government.
You just answered your own question. You state "Iraq is well on its way". That's not a victory yet. Remember the infamous debacle of Bush standing in front of that Mission Accomplished banner?