when SJ's are described as "conservative" it is usually more in the lifestyle sense (Likes to keep things the same, takes fewer chances, etc.) rather than politically conservative. i would expect SJ's to be more likely to go along with an extablished political view, though so many people do so already that it is very hard to tell if that actually works in any amount.
I totally agree with this.
I think people's politics are influenced in large part by their temperaments and their life experiences.
All things being equal an SJ is more likely to have conservative political or religious views, and moreover,
strong such views for some of the temperament reasons Zergling describes.
However, and this is my soap box moment, there is no "all things being equal" when it comes to people's lifes -- we're not talking about an equal playing field or generic upbringings. Political and religious views are determined by temperament and lived experience.
From my personal view, usually people espouse very traditional values and political or religious leanings because they were instilled with it growing up, OR ran towards it and embraced it later in life for salvation or stability or [fill in the blank].
My ISTJ friend, yes, that's ISTJ, the 'trustee' of the MBTI does not have conservative political views. They would be considered very liberal and she received an award from her hometown for her GLBT (gay lesbian bisexual transgender) organizing work. During her acceptance speech she spoke about class issues and how it's difficult for many people to even afford the price of a ticket to that very awards dinner.
It would be unusual with her life circumstances and experiences to embrace a conservative or Republican outlook on life (though of course there are others with similar experiences who are Republican).
But she does have old-fashioned values when it comes to dating and 'social convention' and wrong and right. In that way I do see the structured/conservative part of her nature come through. She's also "conservative" with her money, meaning very thrifty and can stick to a budget.