The Democrats' Race after the Pennsylvania Primary

"Good night, not goodbye for Clinton" reads the Los Angeles Times headline today. Hillary Clinton won a decisive ten-point victory in yesterday's presidential primary in Pennsylvania, but is simply winning no longer good enough for the Clinton campaign? Can she win big enough in the nine remaining contests to catch up with Barack Obama in elected delegates and the overall popular vote? With neither candidate able to win the Democratic presidential nomination through the primary process, when and how will the super-delegates pick a winner?