According to a source close to Al Gore, multiple people in the former VP's orbit are in touch with him on a regular basis to urge an Obama endorsement. According to this source, Gore's hesitation is three-fold:
1.) The memory of the ill-fated Dean endorsement looms large for him.
2.) (Which is somewhat related to 1.) He's worried about somehow jinxing Obama.
3.) He's enjoying the contrast between himself (statesman-like, above the fray) and Bill Clinton, who's been rooting around in the mud for his wife and damaging his legacy in the process.
To that list, I can't help adding a thought of my own: If, as now seems possible, this race goes to the convention and the convention gets deadlocked, is it so crazy for Gore to imagine himself as either a.) one of the party elders who decides the outcome, or b.) a unifying, white knight candidate in his own right? And, if that's not crazy, shouldn't Gore sit tight for now?