In what way is he a partisan? He has condemned as equally bad both the Bush and Obama administrations. When Bush was President, Democrats loved him because he regularly wrote scathing criticisms of Bush's overreaching actions, and now that Obama has carried on Bush's programs (and made them worse, apparently) and Greenwald's criticized him with the same level of intensity, Obama's supporters now seem to loathe him. Reading the things people send him on Twitter, it's disturbing how many people have an absolute hatred of him. It's such a coordinated attack against him, all repeating the same talking points, it brings this to mind:
http://www.guardian.co.uk/technology/2011/mar/17/us-spy-oper...