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The Massachusetts Senate is set to debate a bill intended to help shine a light on donors to political action committees.
A version of the bill approved last month by House lawmakers would require so-called super PACs to disclose their contributors within seven days of running an ad.
The Senate bill up for debate Tuesday would also require disclosure of contributors within seven days.
Under current law the first campaign finance filing deadline for super PACs isn't until Sept. 2 - just eight days before the primary.
Both bills would also double the amount an individual could donate to a candidate in a calendar year from $500 to $1,000. The $500 limit was put in place 20 years ago.
A 2010 Supreme Court ruling allowed outside groups like super PACs and nonprofits to take unlimited contributions.