The graphic at this link shows a wide range of scenarios for potential runoff pairings for the French presidential contest. It comes from a recent Les Echos poll.
The most likely overall scenario remains Emanuel Macron (independent center-left) beating Marine Le Pen (National Front) in the second round. He also beats François Fillon (Republican) by the same margin, 65-35.
Jean-Luc Mélenchon, of the Left Front, does better than I would have expected against various potential runoff opponents, beating Le Pen, 63-37, and Fillon, 59-41. While the idea of Mélenchon making it to the runoff is still a stretch, various recent polls have shown him having surged to within a few percentage points of second place in the first round.
The potential runoff pairing of Le Pen and Fillon is the most worrisome. While Le Pen still loses, it is closer, at 58-42.
Macron beats Mélenchon in the closest (and probably least likely) of these scenarios, 54-46.
Macron has been slipping in first-round polls. What once seemed certain–that he would make the top two and then easily win the runoff–now looks somewhat less so. His position as a runoff contender has become more precarious, with a crowd of three (Macron, Fillon, Mélenchon) along with Le Pen (who is almost certainly going to finish first, or at worst second if Macron recovers).
These results are what always trouble me about two-round majority systems. It is not unusual for the main contest to be for the second slot, and for two or more candidates to be vying for it. And sometimes the runoff pairing can make quite a difference. Fortunately, there is no very likely scenario in which Le Pen draws such a weak opponent that she wins.
Yet the pairing with the scandal-plagued Fillon should give voters pause. Behind whom to coordinate to block him? The obvious choice is, of course, Macron. But Mélenchon may be more competitive than even recent polls suggest, if still more left-wing voters dessert Benoît Hamon, the Socialist Party candidate with no realistic chance of making it to the runoff. Fortunately, as noted, even Mélenchon looks to beat Le Pen, though I’d take a scenario that voters may not have really digested yet with a grain of salt.
The first round is on 23 April.