Pic of 'JFK' sex storm girl Scandal ... Alex Poller By BRIAN FLYNNin New YorkTHIS is the girl at the centre of a sex scandal that threatens Democratic front-runner John Kerry’s run for the White House. Presidential hopeful Kerry, dubbed the new JFK, has denied claims he had a two-year fling with brunette Alex Polier. Alex, 27, was a cross-country runner and in the world affairs club at her Philadelphia school. One source said: “She was attractive, intelligent and one of the leaders in her year.” She went on to graduate from Columbia University, New York, and met Kerry,...