Voters in Seattle, Washington on Tuesday approved a first-in-the-nation “democracy voucher” ballot initiative that could serve as a national model on campaign finance reform.

Initiative 122 (I-122), which was endorsed by nearly every Seattle City Council candidate and enjoyed the support of dozens of local and national progressive groups, passed 60-40, according to the King County Elections Office.

Supporters say the innovative public campaign financing program could give everyday voters more control over the city’s elections while limiting the power of corporate and special interests.

The initiative states that for each city election cycle, or every two years, the Seattle Ethics and Elections Commission (SEEC) will mail four $25 vouchers to each voter. They can only be used in Seattle campaigns for mayor, city council and city attorney. The SEEC will release money to the candidates that agree to follow I-122’s rules, which include participating in three debates and accepting lower contribution and spending limits.

The measure also prohibits elected officials and their high-level staff from lobbying the city government within three years of leaving office and enacts limits on campaign contributions from people or entities that have contracts with the city.