Although he supported Howard Dean in the beginning of the primary election season, Al Gore has come forth with six million dollars in campaign contributions and this statement:
"John will be a great president for all Americans, and I want to do everything I can to help him fight against the outrageous and misleading campaign being waged by the Bush-Cheney campaign," Gore said.
Though not yet an actual endorsement, this is a good thing.
Consider sending a donation to the Kerry Campaign
Here is some Yahoo! about the story