French President François Hollande and his predecessor, Nicolas Sarkozy, are angling for a second face-off in the presidential elections scheduled for May of next year. Over the past few weeks, they've traded barbs, first and foremost about their prowess to fight terrorism. But there is no guarantee whatsoever that they will make it to the second round, or even to the election. Their rivals are actually counting on the public's rejection of such a duel to push them out of the running.