This article examines one aspect of the relationship between European
Union institutions and the French political field: politicians' career
s. What is the value of positions in the Commission and the European P
arliament for French politicians in terms of career mobility? This stu
dy shows that the value of the Commission as a source of domestic poli
tical capital has risen since the 1950s, whereas the value of the Euro
pean Parliament has remained relatively low. The position of Commissio
ner is now comparable to a ministerial-level position. Membership in t
he European Parliament has remained secondary to a national political
career. Yet, as a result of the European Parliament's peripheral posit
ion in the French political field, new social groups, linking the regi
ons to the European institutions or forming cross-partisan interest gr
oups, have been created. Evidence shows that if the European Union ins
titutions present an alternative type of political capital to national
political capital, political careers and ambitions are still formed i
n national terms. National mechanisms for the formation of groups havi
ng a vested interest in the relative autonomy of supranational politic
al institutions have not developed sufficiently. This inadequacy might
be the single most important reason for the democratic deficit in the
European Union.