Far-right leader Marine Le Pen is refusing to endorse either candidate in France's presidential runoff and says she will cast a blank protest ballot. Le Pen, who came in a strong third place in the first round of voting April 22, told her supporters at a big rally in Paris to "vote according to your conscience" and said, "I will cast a blank ballot," explaining that she could not endorse Nicolas Sarkozy or Socialist challenger Francois Hollande. Polls favor Hollande, but Sarkozy hopes to win over Le Pen's voters for Sunday's runoff.