Senator Scott P. Brown on Wednesday accused Elizabeth Warren’s daughter of using her position on the board of a nonpartisan organization in service of her mother’s Senate campaign.

It is the latest exchange between Mr. Brown and Ms. Warren, his Democratic opponent, in what has become the country’s most expensive Senate race – and one that will likely be critical in determining the Senate’s balance of power come 2013.

In a statement released on Wednesday, Mr. Brown, the incumbent Republican senator representing Massachusetts, cited an effort by his state’s Department of Transitional Assistance to mail almost 500,000 voter registration cards to individuals receiving welfare benefits. As part of the effort, the state will also run radio and television advertisements about voter registration and provide additional information on the issue in public assistance offices.

The Boston Herald reported on Wednesday that the effort is expected to cost more than $270,000.

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