More recently, the group ran a radio ad going after Johnson for his opposition to President Barack Obama's Supreme Court nominee. That ad initially referred to Johnson by the wrong first name — Rob, not Ron — but it was quickly fixed.

"Access to reproductive care for Wisconsin's women shouldn't be a partisan issue," Feingold said. "Unfortunately my opponent, Sen. Johnson, has made it one, calling his effort to defund access to healthcare for Wisconsin's women a 'fun vote,’ and backing a divisive ‘personhood’ amendment. Working together, we will fight to ensure Wisconsin women and families have access to the quality, affordable healthcare they deserve."

Earlier this month, a controversial conservative political group targeted Feingold for his record on abortion access in an ad that suggested the Democrat doesn't want Latino babies to be born.

Wisconsin Right to Life, which started rolling out endorsements this summer, hasn't yet weighed in on the Senate race. Pro-Life Wisconsin gave its endorsement to Libertarian candidate Phil Anderson.

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