Sarkozy was the Fifth Republic's first President ever to do so. But if you need to, then look up his predecessors.
Left-wing politicians proudly owned the name, while everyone else claimed to be a centrist, or even to be a bit on the leftish side, or to reject the terminology.
In 1981, no candidate at all professed to be of the Right, even though the first and third places in the first round went respectively to Giscard and to Jacques Chirac.
From next Friday morning, this country is going to be like that.