I don't see how anyone who confronts Obama's record with clear eyes can enthusiastically support him. I do understand how they might concluded that he is the lesser of two evils, and back him reluctantly, but I'd have thought more people on the left would regard a sustained assault on civil liberties and the ongoing, needless killing of innocent kids as deal-breakers.
How are you going to vilify Romney as a heartless plutocrat unfit for the presidency, and then enthusiastically recommend a guy who held Bradley Manning in solitary and killed a 16-year-old American kid? If you're a utilitarian who plans to vote for Obama, better to mournfully acknowledge that you regard him as the lesser of two evils, with all that phrase denotes.
Unlike the author, I don't think Gary Johnson is for me either. But I can definitely get behind the disgust with the President's record on civil liberties and America's own robotic terror campaign.