How much os this is genetic and how much of this is related to their upbringing.
That's a good question.
I'm pretty sure conservatism doesn't directly cause low IQ, so I'm not sure why it matters in this context. You can probably search pubmed for studies related to the genetic portion of IQ. Also, just a heads up, you're forgetting environment (which really is different than upbringing).
I thought the article said low IQ causes conservatism.
They found a connection between the two, as in a correlation. We can't say anything about causation other than what is fueled by our personal prejudices. In my case, I'm inclined to believe it is low IQ causing people to believe right wing rhetoric.
I think conservative political views and religious fundamentalism are not due to a low intelligence, but rather a lack of education stemming from a lack of resources in that country. Countries with a low average IQ are also poorer. http://en.wikipedia.org/wiki/IQ_and_Global_Inequality
The global examples are better explained through poor nutrition, which is known to have a negative influence on IQ. The IQ test is also culturally biased, meaning it is nowhere near as useful as it could be in nations that don't have exposure to western culture, as a result it is a poor tool for international comparisons.
As for education, this could be a factor, but it doesn't explain the relationship very well between the two. What the researchers did was take IQ data from when the participants in the study were 11 and compared that to political views at age 33. They looked at over 4000 men and 4000 women, so the sample size was plenty large. This was also done in the UK, so you're not having a case where a significant portion of low IQ people were from someplace like Alabama and high IQ were from a place like New York. Educational differences are going to result from IQ differences, not the other way around.