The lesbian, gay, bisexual and transgender population is one of the most Democratic demographic groups in the country. According to the 2012 national exit polls conducted by the National Election Pool, gay, lesbian, and bisexual adults voted for Barack Obama over Mitt Romney by more than three-to-one (76% vs. 22%).
This Democratic advantage can be seen in the partisan identification of LGBT adults, a majority of whom are Democrats. It also expresses itself in policy preferences across a range of issues, including size of government, attitudes about gun policy and immigration…
Half of LGBT adults (50%) self-identify as liberal, 37% are moderate, and just 12% say they are conservative.
That’s hardly surprising that people vote for the parties that welcome them given the deep hostility of the Republican Party on lesbian, gay, bisexual and transgender issues. Until the middle of the 20th century, few black Americans voted for the Democratic party because it was the party of racism. People rarely vote for parties that really dislike them.
The transferability of these American results on partisanship to New Zealand is rather limited because there is no cultural war as there is in the USA currently over same-sex marriages. A same-sex marriage bill passed the New Zealand Parliament in 2013 fairly easily. The Christian based socially conservative parties in New Zealand are pretty tame in their rhetoric and still struggling to get into Parliament.
As such, the centre right parties in New Zealand aren’t seen as particularly hostile to the lesbian, gay, bisexual and transgender population. On the same-sex marriage bill, for example, the National Party split evenly on voting for and against, reflecting its moderation in just about every issue.
People of all sexualities can vote for New Zealand parties on grounds other than the fact of how welcoming they are to who they are. That makes the American results on partisanship and sexuality less relevant to New Zealand
Utopia, you are standing in it! 
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