Jean-Pierre Raffarin says he doesn't think DSK is the "most dangerous" of Sarkozy's rivals because he has a "profile rather to the right of the center of gravity of today's Left." He may be right, despite the current polls. So who would be the most dangerous opponent? JPR doesn't say, but if the "center-of-gravity" metaphor is taken seriously, I think it might be François Hollande. In fact, I would be at all surprised to see Hollande emerge as a compromise candidate, the least objectionable to all factions. Assuming that DSK doesn't storm his way to success within minutes of making a formal announcement, which is apparently his hope. As I've said repeatedly, I think that may be a miscalculation on his part.
Who would make a better president, DSK or FH? That's a different question. I wasn't much of a fan of FH as a party leader, but his defects in that post might become virtues in a consensus-building presidency. And DSK might be too much of an economist, too little a politician, and just a bit too intellectually arrogant for a president in the televisual age. (Sarkozy's arrogance is of a different kind: it invites identification with his combativeness, whereas DSK's makes the listener feel ignorant. Remember Mitterrand's "je ne suis votre élève"--one of the most effective debate retorts ever).