APSA:
Organised section on Elections, Public Opinion, and Voting Behavior
http://www.apsanet.org/~elections/

Political Studies Association:
Elections, Public Opinion and Parties Specialist Group
http://www.psa.ac.uk/spgrp/epop/epop.aspx

European Survey Research Association (ESRA)
http://www.surveymethodology.eu/home/

World Association for Public Opinion Research (WAPOR)
http://www.unl.edu/wapor/