John Cole over at Balloon Juice hits it out of the park with this one.
I think what we're seeing is the left starting to try to flag on for size to see if it fits. For decades now in American public discourse the standard formula was Republican = patriotic he-man, Democrat = anti-American effete DFH. Starting with Limbaugh's "I hope he fails" shtick straight through to the recent piratey "crisis", though, the roles seem to have switched. Now it's the right who are being portrayed, tentatively, as the ones who hate America, which forces the left into the "Rah-rah USA! We totally rule!" role.
Neither side seems particularly comfortable yet with their new pose, so we'll have to see how it goes.