And Snowden has never mislead anyone about why he's in Russia. He's said that he would love to come home. And if U.S. whistleblower protections was stronger he could.
Snowden was openly revealing violations of the U.S. constitution.
Assange was covertly acting as an agent of a hostile foreign government with the intention of interfering in U.S. domestic politics.
There is no comparison between these two, at all.