December 23, 2003 at 9:19:47 PSTPoll: Dean Trailing Bush by Wide MarginBy WILL LESTERASSOCIATED PRESSWASHINGTON (AP) -Howard Dean is gaining ground as the leading candidate in the Democratic presidential contest but he appears to be a substantial underdog in a hypothetical matchup against President Bush, a national poll says. The ABC News-Washington Post poll, released Monday, found Dean, a former governor of Vermont, backed by 31 percent of Democrats and those who lean Democratic. All other candidates were in the single digits. Connecticut Sen. Joe Lieberman and Missouri Rep. Dick Gephardt were at 9 percent, Massachusetts Sen. John Kerry at...