Seen on the AP wire:
Sen. Barack Obama of Illinois sealed the Democratic presidential nomination Tuesday, a historic step toward his once-improbable goal of becoming the nation’s first black president.[...]
Obama sealed his nomination based on primary elections, state Democratic caucuses and delegates’ public declarations as well as support from 22 delegates and "superdelegates" who privately confirmed their intentions to The Associated Press. It takes 2,118 delegates to clinch the nomination at the convention in Denver this summer.
From what I understand, reaction from the Clinton campaign was:
"I’m melting!"
(Yes, I know that’s horribly unfair of me. But, while I respect the Clintons’ skill as politicians, that doesn’t mean I like Hillary.)