The party doubled their support in the 2014 general election leaving them holding the balance of power in parliament.
The telephone poll of 9,021 people over the period Nov. 2 to 25 showed the Social Democrat-Green government losing support, dropping to 33.5 percent from 36.6 percent in May.
Support for the four party, center-right Alliance fell to 39.0 percent from 40.6 percent.
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