Alleigh Marre, a spokeswoman for Brown, said Wednesday that the senator favors abortion rights and does not agree with Mourdock. Brown is locked in a close race with Elizabeth Warren in Democratic-leaning Massachusetts.
Mourdock made the comment at a debate Tuesday night. The GOP nominee is in a tight contest with Democratic Rep. Joe Donnelly.
The remark pushed the issues of rape and abortion to the forefront. The campaign of Republican Mitt Romney, who appears in a television ad for Mourdock, said the presidential nominee disagrees with Mourdock.