I just saw this on Special Report with Brit Hume, on the Grapevine section of the program, which should be on the Fox News website in the morning (on the left side of the page). Here's the gist of it: in 1971 at the height of his VVAW involvement, Kerry went on a campus speaking tour. At one college in West Virginia, he said that the US democracy is not the best system in the world and that Communism was not a threat to the US.
The fact that he was so dead wrong on both counts is only part of the point. More important is the unescapable fact that no matter how ineffectual they are, US presidents now will always have a major impact on the world that will last for decades after they leave office. Kerry's inability to nail the most important foreign policy questions of the day is of minimal consequence in his position as a Senator; it will have a major detrimental impact on the world until the 2020s at the least if he becomes president.