Democrats stampeded over each other yesterday to disassociate themselves from John Kerry, their presidential candidate two years ago, who has handed Republicans an election lifeline with remarks implying US troops in Iraq are there because they are stupid.Senator Kerry, speaking to a group of students in California on Monday, said: “You know, education, if you make the most of it, you study hard, you do your homework and you make an effort to be smart, you can do well. If you don’t, you get stuck in Iraq.” A video of his speech was placed swiftly on the internet and then...