The Spring Day campaign benefited from the support of European Commission Vice President Wallström, European Parliament President Pöttering, Commissioner Figel, Commissioner Kovács, Commissioner Ferrero-Waldner, Commissioner Vassiliou, Commissioner Kuneva, Commissioner Orban, more than 70 Members of the European Parliament (MEPs), former Polish President Wałęsa, EESC President Sepi, CoR Vice-President Delebarre, Professor Bengt-Åke Lundvall, Domenico Lenarduzzi and Marc Levy.
Kevadpäeva kampaania toetajad olid Euroopa Komisjoni asepresident Wallström, Euroopa Parlamendi president Pöttering, Komisjoni volinikud Figel, Kovács, Ferrero-Waldner, Vassiliou, Kuneva, Orban, Euroopa Parlamendi üle 70 liikme, endine Poola president Wałęsa, Euroopa Majandus- ja Sotsiaalkomitee president Sepi, Regioonide Komitee asepresident Delebarre, professorid Bengt-Åke Lundvall, Domenico Lenarduzzi ja Marc Levy.