On the basis of these results, the left alliance won in the south of the country, and collected a majority of votes in half of the constituencies in the area.

To compare, during the first round of the 2022 presidential election, the candidate of La France insoumise Jean-Luc Mélenchon came out ahead in the votes in the constituencies of the Ile-de-France region and the overseas territories.

Leading in almost half of the ridings

In the first round of the presidential election, it was Emmanuel Macron who most often came out on top in the territories (256 constituencies), ahead of Marine Le Pen (206) and Jean-Luc Mélenchon (104).

Thanks to this alliance, and if we stick strictly to the results of the presidential election, Nupes passes in front of the two candidates of the second round of the presidential election. The union comes first in 260 constituencies among the 566 of metropolitan France and the overseas territories, against 161 constituencies for Marine Le Pen and 145 for Emmanuel Macron.

Nevertheless, this remains a simple overview, because due to their historical local roots, the balance of power of the parties on the ground is different. It is also necessary to take into account the fact that the method of voting for the legislative elections is not comparable to that of the presidential election.

Deputies are elected by direct universal suffrage, by two-round majority voting and by constituency. To be elected in the first round, a candidate must obtain more than 50% of the votes cast. And in the second round, more than two candidates can present themselves, unlike that of the presidential ballot. The two who came first, and the following candidates, provided they had obtained a number of votes at least equal to 12.5% ​​of the number of registered voters.

However, "we cannot mechanically translate these votes from the first round of the presidential election into legislative votes", tempers Olivier Rouquan, political scientist, teacher-researcher in political science and researcher associated with CERSA (Center for Studies and Research in Administrative Sciences and Policies). But these projections can still shed some light on the possible weight of this alliance of the left during the next legislative elections.

Verdict next June.