As Steve Benen noted this morning, Mitch McConnell has posted this on his Facebook page:

No one's ever mistaken McConnell for a decent, considerate, moderate person, but he's ratcheting up this cackling-wingnut act in an effort to ensure that he won't lose a 2014 primary to a crazy teabagger, much as John McCain did in 2010. So he's not just dancing on Sandy Hook graves, he's doing it cynically.
Which makes him an even viler human being than you thought he was.