CNN's Political Ticker has a short piece predicting that Al Gore won't endorse either of the candidates.
The sources say Gore talks with both Clinton and Obama, and is on good terms with both. But with Sen. John Kerry and Bill Clinton both aligned to a candidate, Gore has a role to serve as the neutral elder statesman in the party.
Jessica Yellin goes on citing two unnamed sources as saying that Gore would be a potential mediator if the need arises.
It goes without saying that a substantiated Gore endorsement would be a big push for either Obama or Clinton, and maybe he doesn't want to "unfairly" weigh in the balance.
A little short I know but I thought I'd bring it to y'all attention.