September 13, 2005 -- While the Rev. Al Sharpton's last-minute endorsement figures to push more African-American voters toward Fernando Ferrer's camp, it could also drive away many white voters, according to a poll conducted over the weekend.

Marist/WNBC pollsters found 15 percent of African-American voters likelier to support Ferrer now and 6 percent less so.

But 26 percent of white voters said they were less inclined to back Ferrer now and just 4 percent said they were likelier to cast a ballot for the ex-Bronx borough president.

Among Latinos, the endorsement was a wash, with 11 percent likelier to back Ferrer now and 11 percent less likely to do so.

And among Democrats as a whole, the endorsement had an immediate negative effect, as 17 percent said they were less likely to vote for Ferrer now and 8 percent said they were likelier to.

City Councilman Charles Barron (D-Brooklyn), meanwhile, ripped Sharpton for not backing Manhattan Borough President C. Virginia Fields.

"We resent your denigration of the only black woman in this race," Barron said Sunday.

"How dare you get on your radio broadcast and lie?"

Sharpton had criticized Fields for not supporting his presidential campaign last year and not speaking out more about cops' fatal shooting of unarmed African immigrant Amadou Diallo in 1999.

Sharpton told The Post yesterday that Barron's claims had "no merit." And he noted that he had supported Barron's bid for mayor over Fields' before Barron dropped out.