Anyone who has trouble with the NYT paywall may read the Groome article here: 

https://www.nytimes.com/2017/03/27/opinion/to-win-again-democrats-must-stop-being-the-abortion-party.html

"But for many traditional Catholic voters, Mrs. Clinton’s unqualified support for abortion rights — and Mr. Trump’s opposition (and promise to nominate anti-abortion Supreme Court justices) — were tipping points." I'm not sure he defends his thesis well.