PRESIDENTAL hopeful John Kerry yesterday rubbished claims he had an affair with an intern - and vowed to "fight back" against smears. And he accused the Bush campaign of doing "anything" it could to deflect from the president's poor showing in the polls. Kerry, 60, was accused on a right-wing website of a relationship with journalist Alex Polier. There is no evidence they had an affair but her father, Terry, 56, has branded Kerry, dubbed the new JFK, a "sleazeball". But Kerry, who is riding high in the polls, yesterday said he was not worried about the report. He added:...