NBC News provides a very helpful update on where the Superdelegate count lies:
We listed the Senate superdelegates endorsements earlier today. We've broken out the House backers as well, and Clinton leads 72-68. That means there are 92 House members who are undecided. Also of note among these House endorsers, 23 of Clinton's 72 are reps from New York (32%). By contrast, nine of Obama's House backers are from Illinois (13%).
Here's how Clinton's and Obama's superdelegate support breaks down:
Among senators: Obama 14-12
Among representatives: Clinton 72-68
Then, among party activists/former party leaders: Clinton leads 171-140
TOTAL: Clinton 255, Obama 222