He supported Tom Mulcair in the 2012 leadership race to succeed Mr. Layton .
Caldwell supported Jack Layton for the federal New Democratic Party leadership in 2002 - 03 .
Caldwell supported Tom Mulcair in the 2012 leadership race to succeed Jack Layton Jack Layton .
Caldwell supported Jack Layton for the federal New Democratic Party leadership in 2002 - 03 .