Snowden’s voting from Russia.
I’m sure that ballot will be super duper top secret. 
Pardoning him would be de facto condoning what he did. A ton of copycats would result. He says the a lot of good but that’s a matter of opinion. Once in possession of his information he made his choice: how top disseminate it. He had options. One would be to approach privacy rights advocates in the Senate like Rand Paul and use the system he claims to love so much to fix what he thought needed fixing. Instead he chose to take sensitive national security information and tote it around the world after copying it to Glen Greewald’s hard drive to be used by Mr. Greenwald to aggrandize himself.
The material was literally dumped for the world to see. It seems privacy is a one way street to Mr. Snowden. Given his claimed value set why would it be wrong to get a copy of his absentee ballot and put it in the front page of China’s and Russia’s major newspapers? Privacy means that. It means folks have a right to do in private what you don’t like.
The notion of a pardon is silly.No POTUS is going to do that. There isn’t a candidate Mr.Snowden can vote for that’s going to do that. He isn’t going to be pardoned. He’ll stay in Russia until a political situation arises in which the Russians see an advantage in booting him ( the same goes for his buddy Assange ) . It takes whopping dose of hubris on Snowden’s part to think he deserves a pardon.
“Privacy advocate”. Well, his own privacy apparently.
He did something that was right in just about as much of a wrong way as he could. Basically, he got played - but I doubt his ego lets him see it that way.