Here are some links on several political organizations which claim the 2009 EU Elections,
big and small, officially recognized, or not, (approximatively classified) :
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ChristianDemocrats/Popular party :
http://www.epp.eu/
http://www.epp-ed.eu/
http://www.europeanreform.eu/
-----------------------
Liberals:
http://www.alde.eu/en/
http://www.eldr.eu
http://www.pde-edp.net/
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Socialists:
http://www.pes.org/
http://www.socialistgroup.eu/gpes
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Left :
http://www.guengl.eu/
http://www.european-left.org
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Greens (and Regionalists) :
http://www.europeangreens.org
http://www.greens-efa.org/
http://www.e-f-a.org
----------------------
Various others :
http://www.libertas.eu
(anti-Lisbon Treaty)
Europeanists :
http://www.europeunited.eu
http://www.neusp.eu/
http://www.newropeans.eu/index.php?lang=fr/
http://e-d-e.org/?lang=en (Esperanto)
Rightists :
http://www.euronat.org/
http://www.europeannationalfront.org/
Leftists :
http://www.anticapitalistleft.org/
(etc)...