Even if it's inconsequential, AlGore will use Katrina and the slow recovery of the area, blame the existing problems on Bush and the Republicans, and the media will back him up.
Plus,he could be the one Dem who can effectively run against Hillary, and get the financial backing of both the extreme internet leftists and the rich Hollywood socialists.
He came close to winning the Presidency before with just the votes of the large urban areas. And the Dems are perfecting the art of vote fraud.
If it looks bad for the Dems towards the end of the primaries, watch for a "Draft AlGore" campaign.