of election polls with at least 1956 polls, which ones have similar respondents as gallup, 2012 presidential election, 2012-07-18?
(AND government.election_poll (AND (JOIN government.election_poll.type_of_people_polled (JOIN government.poll_respondent_category.polls m.0m3j_8f)) (ge government.election_poll.number_polled 1956^^http://www.w3.org/2001/XMLSchema#integer)))