A political committee called An Accountable Miami-Dade is sponsoring a proposal to change campaign finance rules for county elections.

The proposal would limit contributions to candidates to $250, rather than the state-set limit of $1,000, and county vendors and lobbyists would be prohibited from making contributions. A system of matching contributions with public funds would also be created.

The group delivered 125,000 signed petitions to the county clerk of courts. If enough are verified, the county commission will decide whether to adopt the measure or to place it on the ballot. The proposed changes would not take effect until the next county election cycle.