Republican Sen. David Vitter of Louisiana has largely shrugged off his 2007 prostitution scandal and fresher questions about his employment of an aide accused in a knife attack on a woman.
Vitter has been more focused on attacking his likely November challenger, Democratic U.S. Rep. Charlie Melancon, who has countered with attack ads of his own.
Each man is favored to win his party's nomination in Saturday's Louisiana primaries.
Vitter's opponents include a former state Supreme Court Justice, Chet Traylor.
Traylor has had to fend off an accusation that he stole away another man's wife 13 years ago; and he's been criticized for a more recent romantic relationship with the estranged wife of his former stepson.
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