LiveScience reports John Jost, a psychologist at New York University, after an overview of previous studies covering 22,000 in 12 different countries, has claimed that genetics influences political disposition as much as 50%.  His finding suggest that environmental situations only determine half of your political preferences.

John Hibbing, a University of Nebraska political scientist, has demonstrated that identical twins have more similar political leanings than fraternal twins.

The suggestion is not that genes rule your political beliefs but that they influence your tendency to lean one way or the other.