I am also unhappy with list of "famous" social democrats. The list now, before my amendments is:

Karl Ast
Pavel Axelrod
Hjalmar Branting
Ed Broadbent
Gro Harlem Brundtland
Eduard Bernstein 
Gordon Brown
Helen Clark
Ingvar Carlsson
Tommy Douglas
Gary Doer
Fedor Dan
Tage Erlander
Einar Gerhardsen

Felipe Gonzalez
Per Albin Hansson
Bob Hawke
Paul Hirst
L. T. Hobhouse
J. A. Hobson
António Guterres
Toomas H. Ilves
Ricardo Lagos
Mark Latham
Jack Layton
Julius Leber
René Lévesque
Wilhelm Liebknecht
Anna Lindh

Rosa Luxembourg
Ramsay Macdonald
Mihkel Martna
Julius Martov
Aleksandr S. Martynov
Olof Palme
Göran Persson
Georgi Plekhanov
Bob Rae
August Rei
Gerhard Schröder
Jens Stoltenberg
Vera Zasulich

Nothing against Canadians, but they make up too big a proportion of the list. 

I am deleting: Paul Hirst (important academic, but not famous as a social democrat), Richard Dawkins (ditto), Gary Doer (not important enough), Karl Ast (ditto), Mihkel Martna (ditto), Aleksandr S. Martynov (ditto)

I would propose deleting Bob Rae (not important enough), and I think others should have a go at making the list better.