David Espo covers the plight of superdelegates whose constituents have voted for Obama.
US Rep. David Scott (GA) defected to Obama yesterday. Another Georgia representative, John Lewis, is rumored to be wavering.
Sophie Masloff (PA) and Nancy Larson (MN) have gone from Clinton to uncommitted.
Another minor note: the Associated Press gives current superdelegate totals of 241 for Clinton, 164 for Obama. Checking up with CBS and CNN for updated estimates on their sites, I get a three-service average of 230 Clinton, 159 Obama. Obama's closing the gap.
Oh- and even after factoring in the new Pennsylvania poll, I have Obama leading in pledged delegates after Pennsylvania by 1438 to 1374 (est. +/- 20 delegates).
After which point Clinton ain't got much left, unless Michigan and Florida get brought back in. From every commentator's reaction to their efforts to do it, the resulting battle will not be pretty for the Democrats... and could risk opening the way for John McCain.
EDIT: Even as I was typing this post, John Lewis, mentioned above, defected. Quote: “In recent days, there is a sense of movement and a sense of spirit. Something is happening in America, and people are prepared and ready to make that great leap.”