The Senator's wearing it in West Virginia - like Allahpundit notes, can't imagine what he's doing there in the first place - which will no doubt allow him to be truly inspiring to the quaint inhabitants thereof. Or at least give him a shot to be not beaten by 40 points (yes, that bad).
Of course, it does sort of shoot down as nonsensical blathering all that stuff before about his resolute refusal to pander by wearing a flag pin. On the other hand, you can argue that it looks more like he was pandering by not wearing a flag pin, which says quite a bit about a large fraction of his base. On the gripping hand, this change back to a flag pin - now that he's assuming that he's both safe and the nominee - actually gives me a small bit of hope: it suggests that he has almost as low an opinion of the collective brain and spine of progressives as I do.