UNT is a commuter school. Most of those people do live in Denton or nearby.
School website says there are 6,000 students on campus.
They need enough signatures on the petition to exceed 25% of the participation in the last city-wide election. How many do you think that was? A few thousand?
If I were a petitioner, I'd camp out at UNT. My cousin goes to UNT, he said they were everywhere. This is just your basic astroturf vs. monied-special-interest. Everyone else is caught up in their inane shouting match.