I have yet to hear a single principled left-wing argument against what these people did. And no "but paultards like them!" isn't a valid argument - nor is "but they harmed Obama's image!". Some people here are either machiavellians or utter hypocrites.
I don't think there is a left-wing argument against it. It's not really an issue between the left and right. It's an issue of whether what they did was wrong, hurt national security and should be punished, or what they did was expose the government's constitutional abuses and should be protected against prosecution despite criminal activity. There's bipartisan support for each option.
I would agree that people who support the Obama administration over this because they don't like the Pauls or believe that the administration can do no wrong are utter hypocrites, just like the people on the right who are blasting Obama over this yet never said a word when Bush did it.