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Meanwhile, Mr McCain's decision to go on the attack - bringing up Mr Obama's association with a former terrorist, Bill Ayers, founder of the Weather Underground in the Sixties - appear to have hurt his appeal to women, another crucial group, with whom the Illinois senator is enjoying a 12-point lead.
"Clearly the negative campaigning isn't working," said the pollster John Zogby.
Maybe this will be the election where people start talking issues. It finally seems to be gettign through to some people that negative campaigning doesn't work, and people are actually more interested in issues...