The Senate Rules Committee holds hearings on independent groups that run hard-hitting political ads in hopes of influencing voter sentiment in so-called "battleground" states this election season.
Lawmakers from both parties are seeking to outlaw the groups, which are unfettered by restrictions placed on candidates and political parties. The debate comes as a liberal group called the Media Fund launches attack ads against President Bush in 17 states. NPR's Peter Overby reports.
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