
From Nate Silver at 538.com:
"It turns out that you can build a very effective model by including just three variables:
1. The year in which the amendment was voted upon
2. The percentage of adults in 2008 Gallup tracking surveys who said that religion was an important part of their daily lives
3. The percentage of white evangelicals in the state.
...All of the other variables that I looked at -- race, education levels, party registration, etc. -- either did not appear to matter at all, or became redundant once we accounted for religiosity. Nor does it appear to make a significant difference whether the ban affected marriage only, or both marriage and civil unions..."
http://www.fivethirtyeight.com/2009/04/will-iowans-uphold-gay-marriage.html
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