Captain's Quarters has a great piece on Senator Kerry's irresponsible yapping causing problems for those who are in the front lines. In this instance he is providing aid and comfort to supporters of ousted Aristide in Haiti. Here's a quote from the BBC report CQ cites: "The commander of the UN peacekeepers in Haiti has linked a recent upsurge in violence there to comments made by the US presidential candidate, John Kerry."
I do not think this is the first instance in which Kerry's words have caused problems for forces in the field.
I am certain if you visit SwiftVets you will learn of other people whose lives were affected by comments he made in the early 1970's.
Update: Corrected Swiftvet link