I googled them and found the official website:
http://www.pos.org/
The following is from the main page:
Quote:
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The Republican polling firm of Public Opinion Strategies (POS) polled for the only freshman Republican U.S. Senator, one new Governor, and five new members of Congress. Overall, the firm polled for four winning U.S. Senate races, six winning GOP Governors, at least 46 Members of Congress, as well as numerous downticket statewide and legislative winners.
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According to themselves, they are Republican.