It’s clear Al Gore isn’t going to endorse someone before the Iowa caucuses, perhaps gunshy after his Dean endorsement. But that doesn’t prevent him from endorsing someone down the line, does it? If Obama or Edwards win Iowa, they’ll have momentum coming in to New Hampshire. What if Gore endorsed the winner before New Hampshire? It could be the extra "ooomph" they would need to overtake Sen. Clinton there and right into the big Super Tuesday lineups.
The question is, why should he endorse ANYONE before the convention, if then? He doesn’t need to.