Does political risk affect the value of companies?

Does political risk affect the value of companies? First, discuss what is meant by political risk and why it will or will not increase the value of a company.  Briefly discuss the importance of this issue too.  Then, collect and analyse relevant and appropriate data and/or information (this will be your groups' decision) relating to a certain company or industry to test whether or not political risk increases the value of that company or industry.