Who will win the next French legislative election ? This article provides forecasts based on an estimated vote function from local data (départements) between 1986 and 2007. Predicting the presidential winner or presidential outcomes is a recent tradition in France but one that has produced fairly accurate results. Yet the literature has paid less attention to forecasting legislative elections. In this article, I propose to fill this gap by estimating a politico-econometric model where vote decision is based on economic (unemployment, GDP) and political (PM popularity, previous electoral vote share, partisan trend) factors. Based on this model, a defeat for right-wing parties at the second round is forecasted unless, against all odds, Nicolas Sarkozy wins the presidential election.