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A "yes" on Proposition 211 would require entities making independent expenditures to disclose the original sources of money.
If Proposition 211 passes, independent expenditure committees spending $50,000 or more on a statewide campaign or $25,000 or more on a local campaign must disclose the names of the money's original sources that have contributed $5,000 or more.
The original source of money would be defined as the person who earned the money. The measure would also require that reports of transfers of money between donors and original money sources of more that $2,500.
The law would only apply to spending on campaign advertisements.
Voters' Right to Know is leading the campaign in support of Proposition 211.
The coalition argues that better transparency on what groups are financially supporting certain causes and candidates will allow voters to make informed decisions at the polls.
Opponents of the law include the Republican Party of Arizona and the Arizona Free Enterprise Club.
Those opposed say that the proposition will stifle free speech by opening up secret donors to harassment from those who disagree with them.
Voters' Right to Know committee has raised $1,361,128 in contributions, according to campaign finance filings. Contributions to oppose the measure are unknown.
