Actors and politics

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I was thinking about the crossover from acting to political activism that many actors make. I find the presumption that their opinions will be taken seriously mind boggling. Do actors have some inside knowledge? Do actors have some special insights into politics that makes them ideal campaigners for political causes?
If so, then does this special gift also apply to porn actors? Why not? Indeed, Jenna Jameson for example might have strong opinions on Globalization or as much insight into solving world poverty as Bob Geldof or Bono. Personally I am intrigued to hear what Gianna Michaels thinks of Barack Obama.
I would love to see Briana Banks on a political podium. I'm sure the ladies would love to hear Peter North speak on health policy reforms.