The Duval County Democratic Party will join state Sen. Audrey Gibson and other Democratic leaders to urge voters to reject a half-cent sales tax on the Aug. 30 ballot. The Duval County Democratic Party’s executive committee passed a resolution Monday against the half-cent sales tax, which would go toward paying down the city’s huge pension debt. Gibson, D-Jacksonville, is scheduled to join Duval Democratic Party Chairman Neil Henrichsen at an 11 a.m.