Obama won 35% of evangelical Christians in Minnesota. Now 35% sounds like a small minority, but that's more than a third. That means if you go to your typical evangelical church service, every third person voted for Obama.
Now doesn't that just strike anyone as bizarre? Seriously.
All evangelical congregations are not created equal. Some are more conservative than others. I suspect Minnesota has a lot of members of the Evangelical Lutheran Church in America, which tends to be much more liberal than your typical evangelical congregation. Yet, since "evangelical" is in the church's name, many members would consider themselves as such when asked by a pollster. You'd be more likely to run into an Obama supporter there than at some Southern Baptist congregation in Minnesota (if there is such a thing).
Thus, to say that if you go to your typical evangelical church service, every third person voted for Obama is a fallacy. Averages mask variations in data.