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Published 09:48 18 May 2015 BST

"Every time I'm asked I say 'no' and then every time I open up the papers it says 'Guess who's going into politics?"
Not that this means an end to the actor's vocal stance on various issues ranging from foreign aid to military policy.
"I grew up in the sixties where you really were taught that your voice, your responsibility in life is to participate, not just in your own life but in everyone else's...the future isn't inevitable and we have a say in how it ends."Explore more on these topics: