Mike Adams argues that people's political outlook also affects their views on marriage:

"...For libertarians, recognizing marriage in any form is problematic. The true libertarian considers both the conservative and the liberal to be misguided on the issue. Libertarians believe the conservative is wrong to think that government should be in the business of promoting a religious institution. Libertarians believe the liberal is even more misguided to believe that government should recognize and regulate an even broader range of relationships than it already does.

Many self-proclaimed libertarians such as Neal Boortz were outraged at North Carolina voters’ recent affirmation (61% to 39%) of traditional marriage. These confused libertarians are really social liberals with fiscally conservative leanings. They have failed to grasp the merit in preventing a judicial fiat that would have produced greater entanglement between the government and private relationships.

Many liberal Christians were also disappointed by the passage of Amendment One in North Carolina. But it wasn’t their religion that compelled them to oppose it. Liberal Christians are simply more committed to their politics than they are to God. And they value His approval less than that of their fellow man." -- TownHall