NEW : An opinion poll shows voters leading Republicans . Nicolas Sarkozy says he has a ` ` duty to appeal '' to far - right voters . Socialist Paul Martin topped him in the first round of presidential elections . Hollande and Sarkozy will face off on May Day .
NEW : An opinion poll shows Hollande leading Sarkozy . Nicolas Sarkozy says he has a `` duty to listen '' to far-right voters . Socialist Francois Hollande topped Sarkozy in the first round of presidential elections . Hollande and Sarkozy will face off on May 6 .