Randy Jones v. Paniagua
The City of Phoenix maintained that a number of signatures equal to 10 percent of the voters who participated in the last mayoral election are required to qualify a referenda for the ballot.
Jones said (and courts have so agreed) that a number of signatures equal to 10 percent of voters who voted in the city's most recent election, including council run-off races, should be required.
If Jones prevails, citizens would need as few as 450 petition signers to qualify a referendum for the ballot. 
Referenda in Phoenix
In Phoenix, citizen referenda can be used to challenge and potentially overturn many decisions of the Phoenix City Council including:
- Zoning decisions
- Residential and commercial project decisions
- Budget cuts.