By “on the left” you mean the NYT, WaPo, Atlantic, ProPublica, and 24 Democratic Senators not including Wyden and Udall?
Lawmakers Question White House Account of an Internet Surveillance Program
A lengthy statement from Senators Ron Wyden of (D) Oregon and Mark (D) Udall questioned the Adminstration’s statements.
It seems that these Senators trust Snowden more than Obama and his adminstration.