The good news is that support for Bush continues to decline. A brand new Newsweek poll has Bush at his lowest numbers ever since they began conducting polls:

...neither good news on the economy, the passage of a Medicare bill nor his surprise Thanksgiving visit to Baghdad seem to have boosted President George W. Bush’s approval ratings among all registered voters: with 51 percent approving and 42 disapproving, his ratings are the lowest in the NEWSWEEK poll’s history. And less than half (45 percent) of voters say they want Bush to be reelected.

34% say Dean can't beat Bush, and Bush would still win over any Democrat:

the president retains a 49 to 42 percent lead among all registered voters in a two-way race

Gore's endorsement helped Dean, no question, but it may not be enough:

Dean’s virulent opposition to the war is not necessarily appealing to voters, more of whom say Dean does not represent their views on Iraq (34 percent) than say he does (26 percent). Just 22 percent of them say Dean’s views on Iraq resonate with them. The man most Democrats (27 percent) consider best suited for the role of leader in Iraq is Clark; only 16 percent consider Dean the most qualified Democrat for that role and even fewer (12 percent) Lieberman.