These two pieces are essential reading:

Glenn Greenwald, “The Misery of the Protracted Presidential Campaign Season”
Charles Davis, “I’ll Take the Reactionary Over the Murderer, Thanks” (n.b.: some bad language)

There is much of value in these as well, though be warned that the second one is essentially an indictment of the Left:

Anthony Gregory, “On War, Obama Has Been Worse Than Bush”
Anthony Gregory, “Why the Left Fears Libertarianism”