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I have the exact same question. I will place and up vote and see if my steem power changes, and say what happens here.

Okay, i just upvote the above blog, and as far as i can tell no numbers in my wallet have changed. Either voting is free, or it takes a while for the vote to kick in and your wallet to change.

STEEM POWER is not spent on votes.
(votes are totally free and can even bring you curation rewards)

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