This is a regional election. The rules are not the same as national elections.

As for governments, there may be two or more parties involved in forming one. The left in government, for example, generally includes, with the PS as principal group, les Verts, the PC, the Radicaux de Gauche. The right, for most of the 5th Republic, has composed governments out of the Gaullists and the "centre" right (typified by Giscard). Only recently has Sarkozy attempted to create one hegemonic party on the right, the UMP.

Mostly, these coalitions arise before or during elections (between the two rounds). This is, it's true, unlike coalitions in Germany.