The mayor led a rally at Figarden Elementary School in Northwest Fresno where supporters of "Measure Q" are hoping voters will pass the initiative in November's election.
The $280 million bond would be used to continue improvements to Fresno Unified schools.
Supporters claim the bond will not raise any additional taxes that people are already paying for.
"We need that help do much because kids that work in an environment that is good for learning makes their situation better. They're going to be tax payers, not tax users," Fresno County Superintendent Larry Powell said.
If passed -- the money would be divided among all levels of Fresno Unified's schools including upgrading all of its high schools.