Howard Dean has a double-digit lead over rival John Kerry in a New Hampshire poll of likely voters in the state`s Democratic presidential primary. Wesley Clark of Arkansas was well back in the pack. The poll by American Research Group of Manchester, New Hampshire showed the former Vermont governor supported by 29 percent of likely voters. Massachusetts Senator Kerry was at 19 percent. Representative Dick Gephardt of Missouri and Senator Joe Lieberman of Connecticut received six percent support, Clark five percent and Senator John Edwards of North Carolina 3 percent. While nine in ten in the poll said they were aware of Clark, almost half of the sample said they don`t know enough about him to form an opinion. Clark was at two percent in the September poll. The poll had a margin of error of plus or minus three percentage points. It was conducted between last Friday and yesterday.