Overall, the graphs show that since Super Tuesday, at the beginning of February (over 3 months ago), Hillary has been losing ground to Obama. That's a clear trend, clear momentum, in his direction, and it hasn't changed, even after Rev. Wright, even after Hillary "finding her voice." From ABC, via Ben Smith:
1. Delegates won in the primaries and caucuses:
2. Superdelegates - i.e., members of Congress, Governors, DNC officials. (Note: I added the last data point, for May 13 (today)):