Here's a link to a more recent Kerry pro-pre-emption statement, from July 17. This is what pushed me in to the Kerry camp.
http://www.commondreams.org/headlines04/0717-03.htm
Selected Quote: "Kerry said the intelligence needs to be improved so that the word of a U.S. president "is good enough for people across the world again."
But he added, "I will never allow any other country to veto what we need to do and I will never allow any other institution to veto what we need to do to protect our nation."