According to a Charlotte Observer/WCNC Poll 52% of Mecklenburg residents support keeping the county's half-cent sales tax for mass transit projects like buses and light rail. 45% oppose the tax. A vote on the tax, which was initially approved by referendum in 1998, is scheduled for the November ballot.
I don't have the complete crosstabs, but the article linked to above does a job explaining what groups favor or oppose the tax. Interestingly, Republicans support the tax at a higher rate than Democrats. Also, poorer residents said they were less likely to use the mass transit system, while the wealthiest residents were the most likely to ride. That's opposite the conventional wisdom on who would most benefit from mass transit.
We'll keep an eye on this referendum.