Actually, Sanders is pro-Snowden. Sanders has said that he will bring back Snowden and will make sure that a reasonable settlement is reached wrt. copying data and public benefit.

Edit: "In my view," Sanders continued, "the interests of justice would be best served if our government granted him some form of clemency or a plea agreement that would spare him a long prison sentence or permanent exile from the country whose freedoms he cared enough about to risk his own freedom." (added the actual comment)