Following the 2016 Post-Access Hollywood Trump playbook, the Christian Right is taking a strictly transactional stance, making clear it doesn't care about the allegations so long as Walker delivers the goods if he is elected:
Walker’s Christian fans unfazed by abortion revelations
The anti-abortion GOP Senate nominee's supporters say they care more about his policies than about his behavior.
He could abort someone on Fifth Avenue and he still wouldn’t lose any voters.
The Republican Party believes in banning abortions, with an exception for the life of the Party.
This could end up like Bill Clinton where many people will be willing to forgive Walker for the indiscretion, but won't forgive him for lying (from the Politico article):
"“It was 2009, it was a long time ago. His views can change,” Bulloch said of the alleged abortion. “But it bothers me that he lies. He seems like he lies a lot.”"
Or maybe because of Trump, everyone is so accustomed to constant lying nobody will care...