The National Right to Life Committee has spent about $45,000 sending out mailers supporting Senator Scott Brown, even as he supports legalized abortion.
The expenditure for the mailings, reported over the last several days to the Federal Elections Commission, cannot legally be approved by Brown.
He has received endorsements from several groups that oppose legalized abortion, in part because of his opposition to President Obama's health care law and his support for a measure that would have allowed employers and churches to restrict health coverage for treatments or procedures they find morally objectionable. Brown's vote against Obama's health care law was unrelated to the abortion issue.
Several groups that favor abortion rights support Elizabeth Warren, Brown's Democratic challenger.
Brown has repeatedly said that he is pro-choice and believes Roe v. Wade should not be overturned. The issue has emerged several times in the election, both in debates and advertisements, as the candidates fight for women's votes.
Messages left with the National Right to Life Committee this morning were not immediately returned.
Brown and Warren have signed a pledge designed to prevent outside groups from placing ads on television, radio, and online. But the ad does not cover direct mail, which has flooded voters' mailboxes in recent days.