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You can sing even if you are not US citizen. I'm from Moscow/Russia and already me and my wife signed petition. So you can ask your European friend to sign it too. Hope we will achieve 100k soon.
I think everyone have to post message to sign petition through the Internet.
for example Elon's message "@elonmusk: Please support the White House petition to allow direct sales of cars to consumers in all states allow Tesla Motors to sell directly to consumers in all 50 states. | We the...